Concussions occur when biomechanical forces transmitted to the head cause the brain to move rapidly within the skull. This can result from a direct blow to the head, face, or neck, or from an indirect force transmitted through the body, such as a hit to the torso that causes the head to whip back and forth. The rapid acceleration and deceleration lead to shearing and stretching of brain cells, alterations in blood flow, and temporary disruption of normal brain function. Unlike fractures or obvious external injuries, concussions are primarily functional disturbances, meaning the brain’s signaling and metabolic processes are disrupted even though standard imaging may appear normal.
At the microscopic level, the sudden mechanical impact causes neuronal membranes to deform, which triggers a cascade of chemical changes. Ions such as potassium and calcium shift in and out of cells abnormally, neurotransmitter release becomes dysregulated, and the brain enters a state of metabolic crisis where energy demand increases while blood flow may be reduced. This mismatch can make the brain more vulnerable to additional trauma in the days and weeks following an initial concussion. The brain’s attempt to restore balance under these conditions helps explain why symptoms—such as headache, dizziness, and cognitive slowing—often emerge or worsen in the hours after the injury rather than immediately resolving.
Concussions arise from both linear and rotational acceleration of the head. Linear acceleration refers to straight-line forces, such as a direct frontal collision, while rotational acceleration occurs when the head is rapidly turned or twisted, often producing more extensive shearing forces within the brain. Rotational components are believed to be particularly important in causing diffuse injuries that affect widespread brain networks. Even relatively modest forces, if applied at certain angles or repeated over time, can disrupt the neural pathways responsible for balance, vision, mood regulation, and executive functions.
The location and direction of the applied force influence the pattern of injury and symptoms. Impacts to the front of the head may more commonly affect attention and executive functioning, while blows to the side can disrupt vestibular and visual systems, leading to balance problems and sensitivity to motion. However, the brain moves as a whole within the skull, so even localized contact can result in widespread neurophysiological changes. In many sports, forces are transmitted not only through helmet or skull contact but also through the jaw, facial bones, and cervical spine, which helps explain why dental and jaw injuries often coexist with concussive events.
Individual vulnerability to concussion varies significantly. A person’s neck strength, reaction time, prior injury history, and underlying neurological or mental health conditions can all influence how the brain responds to similar forces. Weaker neck musculature can allow greater head acceleration during collisions, potentially increasing the magnitude of brain motion. Age also plays a role; younger athletes may be more susceptible to prolonged symptoms, while older adults can have additional vascular or structural risk factors. Genetics and preexisting conditions such as migraine, anxiety, or learning differences may modify both acute symptom profiles and recovery trajectories.
Symptoms of concussion reflect the diffuse nature of brain dysfunction. They typically fall into several domains: physical (headache, nausea, dizziness, visual disturbances, balance problems, sensitivity to light and noise), cognitive (slowed processing, difficulty concentrating, memory complaints), emotional (irritability, sadness, anxiety), and sleep-related (insomnia, excessive drowsiness, altered sleep patterns). These symptoms may appear immediately or be delayed, and they often fluctuate in intensity. Importantly, loss of consciousness is not required for a concussion diagnosis; many concussions occur without any blackout or obvious dramatic event, which can lead to underrecognition and delayed prevention efforts.
Because concussions affect brain function rather than producing a clear structural lesion, diagnosis relies heavily on symptom reporting, clinical examination, and sometimes neurocognitive testing. Sideline assessments in sports typically include brief memory and balance checks, symptom questionnaires, and evaluation of eye movements. More detailed evaluations in clinical settings might assess processing speed, reaction time, vestibular and oculomotor function, and mood. This reliance on subjective symptoms and performance-based tests underscores why some injuries are missed and why objective biomarkers are actively being pursued in concussion research.
Repeated concussive and subconcussive impacts raise particular concern. Even when a single event seems mild, cumulative exposure to head impacts over seasons and years can contribute to longer-term changes in brain structure and function. Athletes in collision and contact sports may experience hundreds or thousands of low-level hits that do not cause obvious symptoms but still transmit mechanical energy to the brain. This pattern of repetitive impact is associated in some studies with persistent cognitive difficulties, mood changes, and, in a subset of individuals, neurodegenerative processes that may manifest later in life.
The time course of metabolic and physiological recovery after concussion is often longer than the visible symptom resolution. While symptoms may diminish within days or a few weeks for many individuals, experimental and imaging studies suggest that certain aspects of brain function can remain altered for a longer period. During this window, a second injury can be especially dangerous, potentially leading to more severe symptoms, prolonged recovery, or in rare cases catastrophic brain swelling. This concept underpins modern return-to-play and return-to-learn protocols, which emphasize graduated activity, close monitoring, and prioritizing brain recovery over rapid return to competition.
Understanding these mechanical and physiological aspects of concussion is central to developing effective prevention strategies. Measures such as rule changes, coaching techniques that limit unnecessary contact, strengthening of neck and trunk musculature, and properly fitted equipment all aim to reduce the magnitude and frequency of head acceleration events. Devices that provide protection for the teeth and jaw, like mouthguards, have traditionally been used to prevent dental trauma, but their relationship to the forces that cause concussions is more complex. Clarifying how different pathways of force transmission contribute to brain injury helps inform ongoing debates about which forms of protective equipment meaningfully reduce concussion risk and where additional research is still needed.
How mouthguards are designed to protect
Mouthguards are primarily engineered to protect the teeth and soft tissues of the mouth, but their design also intersects with how forces are distributed through the jaw, face, and skull during an impact. At the most basic level, a mouthguard creates a cushioning interface between the upper and lower teeth. When a blow is delivered to the chin or lower face, the guard helps absorb and spread that force over a wider area and time frame, which can reduce peak pressures on individual teeth and the surrounding bone. This redistribution of energy is central to their role in dental injury prevention and is also the mechanism by which some have hypothesized they might influence concussion risk.
Most athletic mouthguards are constructed from thermoplastic materials, such as ethylene-vinyl acetate (EVA), which soften when heated and become more rigid as they cool. These materials are chosen for their combination of resilience, elasticity, and ability to deform under load without fracturing. When compressed by a blow, the mouthguard briefly changes shape, converting some of the mechanical energy into heat and spreading the force across its volume. Thicker and denser regions can offer greater resistance to penetration and higher energy absorption, but overly bulky designs may interfere with breathing or speech, which can reduce compliance among athletes.
The fit and fabrication method are critical to how a mouthguard functions. Stock mouthguards are pre-formed, inexpensive, and usually the least protective because they do not conform closely to an individual’s teeth and are often held in place by biting down. This constant clenching can lead to jaw muscle fatigue and may not provide stable cushioning at the moment of impact. Boil-and-bite mouthguards are softened in hot water and then molded by the user’s bite, offering a more customized fit but still depending heavily on user technique. Custom-fabricated mouthguards, created from dental impressions by a dentist or dental laboratory, generally achieve the most precise adaptation to the teeth and gums, optimizing both retention and coverage.
An effective mouthguard should cover the maxillary (upper) teeth, extend over the gums, and provide an even occlusal surface when the lower teeth contact it. This design helps distribute forces more evenly across multiple teeth and the upper jaw rather than concentrating them on a few contact points. Proper extension into the vestibular areas (between gums and cheeks or lips) adds additional surface area for force dispersion and increases stability so the guard stays in place during rapid jaw movements. If the guard is too short, too thin in critical areas, or poorly contoured, its protective capacity diminishes and it may be more likely to dislodge at the moment it is needed most.
Some designers have focused on the interface between the mandible (lower jaw) and the maxilla (upper jaw) as a potential pathway for reducing head acceleration. The idea is that by creating a slightly increased vertical dimension—essentially a small separation between the upper and lower teeth cushioned by the mouthguard—the jaw can act like a shock absorber when a blow is delivered to the chin. The guard compresses, allowing the mandible to decelerate over a longer time, which could theoretically decrease the peak force transmitted through the temporomandibular joint to the skull base. This concept is extrapolated from basic impact mechanics, where prolonging the time over which a force acts can lower the peak acceleration experienced by structures like the brain.
Another design feature sometimes discussed in relation to concussion prevention is mandibular repositioning. Certain mouthguards are shaped to guide the lower jaw into a slightly forward or downward position. Proponents suggest this might change the alignment of the jaw and cervical spine, potentially improving muscle activation patterns in the neck or altering how forces travel from the mandible to the skull. Some devices incorporate ramps or contours intended to control how the lower teeth engage the guard, attempting to channel forces away from vulnerable structures. However, while these biomechanical theories are intriguing, objective evidence that such repositioning significantly reduces concussion risk remains limited and mixed.
Material stiffness and layer configuration also influence how a mouthguard performs under load. Multi-layer designs may use a softer inner layer for comfort and fit, combined with a harder outer shell for structural support. Reinforced zones can be added in areas more prone to direct impact, such as the incisal (front tooth) region in sports like hockey or basketball. The interplay between softness and rigidity is important: a guard that is too soft may bottom out under a high-energy blow, allowing teeth to collide or forces to transmit more directly to the jaw, while a guard that is too rigid may not dissipate energy effectively and could feel uncomfortable, leading to inconsistent use.
Ventilation and speech considerations influence practical design decisions that indirectly affect protection. Athletes are more likely to consistently wear a mouthguard that allows easy breathing and communication. To address this, some models include channels for airflow even when the teeth are together, or they are shaped to minimize bulk in the palate and tongue space. If athletes frequently remove or chew on their guards because they are uncomfortable or interfere with performance, any potential benefit for injury prevention is compromised. Thus, real-world protective value depends not only on theoretical biomechanical properties but also on usability and player adherence.
Mouthguards may also interact with neuromuscular factors that can influence head kinematics. A comfortable, stable bite surface can promote more symmetrical jaw muscle activation and may reduce involuntary clenching. Some researchers have speculated that this could improve neck muscle readiness or reduce excessive forces transmitted through a rigidly clenched jaw during an impact. In practice, the magnitude of these neuromuscular effects and their relevance to concussion risk remain under investigation, but they highlight how oral appliances can affect not just structural protection but also functional aspects of posture and muscle control.
From a safety standpoint, standards set by organizations such as the American Dental Association and various sport governing bodies guide basic design parameters. These include minimum thicknesses in certain regions, requirements for coverage of specified teeth, and criteria for retention and material performance. Laboratory tests often subject mouthguards to controlled impacts to evaluate how well they absorb energy, resist tearing, and maintain integrity over time. While these tests are more directly linked to dental trauma protection than to brain injury, they help ensure that the devices perform reliably under repeated loads, environmental changes, and the mechanical stresses of competition.
In recent years, some mouthguards have incorporated embedded technology such as accelerometers and gyroscopes to measure head or jaw motion during play. These “smart” guards are designed not only to provide physical protection but also to capture data on impact frequency, direction, and magnitude. The primary goal of these systems is monitoring and research rather than direct concussion prevention, yet their presence has implications for design. Space must be allocated within the device for sensors and batteries without compromising fit, comfort, or protective properties. This integration of protective function with data acquisition reflects a broader trend in sports equipment design aimed at better understanding and eventually mitigating concussion risk.
Despite these innovations, it is important to recognize the limitations of what mouthguard design can realistically achieve with respect to brain protection. The forces that cause concussions often involve complex rotational accelerations of the head, which are difficult to meaningfully reduce through a device that primarily interfaces with the teeth and jaw. While a well-designed mouthguard can significantly lower the likelihood and severity of dental and oral injuries and may modestly influence how some forces are transmitted through the facial skeleton, the extent to which these design features translate into reduced concussion risk remains an active area of investigation. The gap between theoretical mechanical benefits and demonstrated reductions in real-world concussion rates underscores why careful, sport-specific evidence is needed before making strong claims about their role in head injury prevention.
Evidence on mouthguards and concussion rates
Research examining whether mouthguards reduce concussion risk has produced mixed and sometimes conflicting evidence. Many early studies were observational and focused on athletes who chose to wear mouthguards compared with those who did not. These designs are vulnerable to bias because athletes who consistently use protective equipment may also differ in other ways that affect concussion risk, such as playing style, position, or adherence to coaching instructions. As a result, apparent associations between mouthguard use and lower concussion rates in some early reports may not reflect a direct causal effect of the device itself.
One of the key challenges in evaluating concussion prevention is the variability in how concussions are recognized and reported. Different leagues, teams, and even individual clinicians may use different thresholds to diagnose and document a concussion. Athletes may underreport symptoms to avoid being removed from play, and staff may have differing levels of training in concussion identification. These inconsistencies can obscure true relationships between equipment use and injury rates. When an athlete’s concussion goes undiagnosed, it is not counted in the data, potentially skewing comparisons between players who wear mouthguards and those who do not.
In collision sports like American football and rugby, several cohort and case–control studies have tried to determine whether consistent mouthguard use correlates with fewer concussions. Some analyses have suggested a modest reduction in concussion incidence among mouthguard users, particularly when comparing custom-fit guards with stock or boil-and-bite versions. However, other large-scale studies have found no statistically significant difference in concussion rates after controlling for variables such as playing position, exposure time, and level of competition. This inconsistency has led many experts to conclude that if there is a protective effect against concussion, it is likely small and context-dependent.
Randomized controlled trials would provide stronger evidence, but they are difficult to conduct in this context. Assigning athletes to a group without mouthguards may conflict with existing rules or best-practice guidelines for dental protection in some sports. Even when randomized designs are attempted, adherence can be problematic, because players may remove or modify guards during play, or seek alternative devices outside the study protocol. These practical issues limit the number and quality of high-level trials available to inform definitive conclusions about concussion prevention.
Among youth athletes, the evidence base is particularly important because developing brains may be more vulnerable to both concussion and its cumulative effects. Studies in youth ice hockey, football, and rugby have demonstrated clear benefits of mouthguards in reducing dental injuries, cut lips, and jaw trauma. When researchers have also tracked concussions, some youth cohorts have shown lower reported concussion rates among mouthguard users, but again, the results are not uniform. Age, coaching emphasis on safe techniques, and variability in rule enforcement can all influence outcomes and make it difficult to isolate the contribution of mouthguards to head injury risk.
Helmeted sports provide an additional layer of complexity. Helmets are designed to attenuate linear forces and some aspects of head acceleration, so any incremental effect of a mouthguard must be detected against the background protection already provided by the helmet. In American football and lacrosse, for example, mouthguards may primarily prevent dental damage from high-speed impacts that bypass or penetrate the helmet shell, while having little measurable influence on the rotational forces thought to be critical in concussion. As a result, some helmeted-sport studies show strong benefits for oral and facial injury reduction with minimal or no apparent change in concussion incidence.
In non-helmeted sports such as basketball, soccer, field hockey, and combat sports, the situation can be different. Here, direct blows to the jaw, cheek, or mouth are more common pathways of head trauma. Several observational studies in basketball and soccer have reported lower rates of orofacial injury and, in some cases, trends toward reduced concussion risk among regular mouthguard users. In combat sports like boxing, martial arts, and mixed martial arts, mouthguards are nearly universal, making it difficult to find comparable non-using control groups. Instead, investigations often compare different types of guards, focusing primarily on dental and soft-tissue outcomes, with limited and inconclusive data on concussions.
Meta-analyses and systematic reviews that pool data across multiple sports and study designs have attempted to clarify the overall picture. Many of these reviews consistently confirm that mouthguards are highly effective for the prevention of dental trauma, chipped teeth, and lacerations to the lips, cheeks, and tongue. When it comes to concussions, however, most reviews describe the evidence as weak, inconsistent, or insufficient to support definitive claims. Some pooled analyses detect a small protective association, but the authors frequently emphasize that the underlying studies differ in methodology, definitions, and quality, limiting the strength of any conclusions.
Measurement of head kinematics has also been used to explore whether mouthguard use changes the forces experienced during play. In some research settings, “smart” mouthguards with embedded sensors have recorded linear and rotational accelerations during impacts to the head or jaw. These data have shown that significant accelerations can be transmitted through the mandible during direct chin blows, supporting the theoretical pathway by which a mouthguard might alter force transmission. However, the mere presence of an impact does not equate to concussion, and current sensor technology cannot reliably distinguish between injurious and non-injurious events. As a result, sensor-based studies are more useful for characterizing exposure than for proving prevention.
Another source of uncertainty lies in the heterogeneity of mouthguard designs included in studies. Some investigations simply classify athletes as “mouthguard users” without differentiating between thin, over-the-counter devices and thicker, custom-fabricated appliances designed to optimize force dispersion. If higher-quality, custom guards do offer better protection, pooling them with low-quality or poorly fitted guards could dilute any signal in the data. A few studies that specifically examined custom mouthguards have suggested more favorable trends regarding concussion rates, but sample sizes tend to be small and confounding factors difficult to eliminate.
Behavioral and psychological factors may also influence the relationship between mouthguard use and injury reporting. Athletes who are required to wear mouthguards, or who invest in custom devices, might be more likely to receive regular dental or medical care. This closer contact with health professionals can facilitate earlier recognition and documentation of concussions, paradoxically leading to higher recorded concussion rates in the more “protected” group. On the other hand, some players may feel more confident or aggressive when wearing extra protection, potentially engaging in riskier behaviors that offset any mechanical advantage provided by the device.
Professional and advisory organizations often review the existing evidence when issuing guidance. Many dental and sports medicine groups strongly recommend mouthguard use for the prevention of dental and orofacial injuries and view any potential reduction in concussion risk as an uncertain but welcome bonus rather than a primary justification. Position statements frequently highlight that there is no harm, and substantial benefit, in wearing a properly fitted mouthguard, but they caution against marketing or promoting these devices as a guaranteed solution for concussion prevention. Overstating their role could mislead athletes, parents, and coaches and detract attention from other critical strategies such as rule changes, technique training, and proper management of suspected concussions.
Across the available literature, a nuanced pattern emerges: mouthguards clearly provide significant protection for the teeth, gums, and soft tissues, and they may modestly affect how some forces are transmitted through the jaw and skull. Yet the current body of evidence does not support viewing them as a standalone or highly effective tool for reducing concussion rates. Instead, they should be considered as one component within a broader safety framework that addresses impact mechanics from multiple angles, including coaching practices, conditioning, enforcement of rules against dangerous play, and timely clinical evaluation of head injuries.
Sport-specific considerations and recommendations
How mouthguards function in real athletes depends heavily on the sport’s rules, typical impact patterns, and overall risk profile. In collision and contact sports, they are best viewed as part of a layered prevention strategy tailored to that environment, not a universal, one-size-fits-all solution. Sport governing bodies, team clinicians, and coaches should weigh both the clear dental and orofacial benefits and the more uncertain concussion-related advantages when setting policies and offering recommendations.
In American football, mouthguards are widely mandated, primarily for dental protection. Impacts often involve helmet-to-helmet or helmet-to-body contact, with significant rotational acceleration of the head. Because the main forces responsible for brain injury typically bypass the jaw, mouthguards are unlikely to dramatically change concussion rates. Nonetheless, they remain essential for preventing broken or avulsed teeth, jaw fractures, and lacerations inside the mouth. For linemen and players in high-contact positions, custom or high-quality boil-and-bite guards are advisable, as they better tolerate repeated blows and are less likely to dislodge during intense scrimmage. Teams should emphasize consistent wear during all practices and games and incorporate checks into pre-play equipment inspections.
Rugby union and rugby league feature frequent tackles, rucks, and scrums with substantial forces to both the head and face. Unlike American football, players are usually not helmeted, so the mouth, jaw, and facial bones are more exposed. Mouthguards are strongly recommended and often required in many competitions, with robust evidence supporting reduced dental trauma and oral lacerations. While concussion risk remains high due to tackling mechanics and open-field collisions, using a well-fitted guard may help mitigate the effects of direct jaw blows, which occasionally contribute to head injury. Youth and amateur rugby programs should treat mouthguards as standard kit, encourage custom devices when feasible, and pair equipment use with coaching on proper tackling technique and strict enforcement of rules targeting high and dangerous contact.
Ice hockey combines high speeds, hard surfaces, sticks, and pucks, creating multiple avenues for orofacial injury. Even with helmets and face shields or cages, blows to the jaw and lower face occur, especially in adult or professional leagues where full cages may be less common. Mouthguards provide a crucial layer of protection against chipped or avulsed teeth and soft-tissue damage and may help buffer some impact forces transmitted through the mandible. Players at all levels, including goalies who face frequent puck impacts, benefit from custom or carefully fitted boil-and-bite guards. Teams should integrate education on both mouthguard care and adherence, emphasizing that removal during shifts—often done for comfort or communication—undermines potential protective effects.
In lacrosse, stick checks, collisions, and balls traveling at high speed present risks to the face and teeth, and mouthguards are often mandated by rule, particularly in youth and women’s play. Given the combination of stick-related facial impacts and body contact, consistent use substantially reduces dental injuries. Whether they meaningfully alter concussion risk remains less clear, but nonuse or casual compliance (such as letting the guard hang out of the mouth) clearly compromises dental protection. Coaches and officials can reduce injury risk by enforcing mouthguard rules with the same seriousness as helmet and eye protection requirements, and by educating players that chewing, trimming, or reshaping their guards can degrade performance.
Basketball, though not classified as a collision sport, involves frequent unanticipated contact to the mouth and face from elbows, forearms, and falls. Concussions may result from both direct head blows and indirect mechanisms when players hit the floor. Mouthguards are not universally mandated, but growing evidence supports their role in reducing chipped teeth, lip cuts, and tongue injuries. For players in positions with more in-the-paint contact (such as centers and forwards), routine use is advisable. Custom guards or high-quality boil-and-bite options that balance bulk and breathability are most likely to be worn consistently. Teams at scholastic and collegiate levels can promote mouthguard adoption as a relatively inexpensive, low-friction step in an overall injury prevention program, while clarifying that they are not a guarantee against concussions.
Soccer (football) presents a different profile. Heading the ball, aerial challenges, and collisions between players can cause both orofacial trauma and concussions. However, many leagues do not mandate mouthguards, and adoption remains variable. For defenders and strikers who engage in frequent heading duels and high-speed contests, voluntary use can reduce dental trauma from accidental elbows or head clashes. Lightweight, low-profile guards that do not significantly alter speech or breathing are more acceptable in this endurance-heavy sport. Coaches and sports medicine staff should focus on safe heading technique, enforcement of rules against dangerous challenges, and prompt concussion evaluation, viewing mouthguards as an optional but beneficial tool, particularly for players with orthodontic appliances or prior dental work.
In field hockey and similar stick-and-ball sports, direct blows from sticks and balls to the lower face are common enough that mouthguard policies are often stringent, particularly in youth and women’s leagues. The evidence strongly supports a reduction in tooth fractures and soft-tissue injuries with regular use. Because many concussions in these sports result from stick or ball impact to the head rather than through the jaw, the main value of mouthguards remains dental rather than brain protection. Standard recommendations favor custom or higher-grade boil-and-bite devices with sufficient thickness in the front teeth region. Educational efforts should highlight that trimming guards for comfort can leave critical areas underprotected.
Combat sports such as boxing, kickboxing, mixed martial arts, and martial arts disciplines feature repeated, direct blows to the head and face as core elements of competition. Mouthguards are universally recognized as mandatory equipment to protect teeth, lips, and the temporomandibular joints. Because punches and kicks frequently land on the chin and jaw, there is a plausible biomechanical basis for some reduction in force transmission to the skull when high-quality guards are used. Nonetheless, the overall concussion risk remains high due to the magnitude and frequency of impacts, and no mouthguard can counteract the fundamental mechanics of repeated head strikes. Practitioners and coaches should prioritize thick, well-fitted guards—often custom-fabricated—alongside strict adherence to weight matching, officiating that prevents unnecessary blows after knockdowns, and clear medical protocols for post-bout evaluation and mandatory rest after concussive events.
In wrestling and grappling-based sports, the risk of direct blows to the teeth is lower than in striking disciplines but still present through accidental collisions, falls, or takedowns. Some organizations mandate mouthguards, especially when athletes wear braces. While their effect on concussion rates is minimal, they meaningfully reduce lip and gum trauma and protect orthodontic hardware. Given the close-contact nature of these sports, comfort and low profile are critical for compliance, suggesting that custom or carefully trimmed boil-and-bite devices are preferable. Coaches should pair mouthguard use with instruction on safe takedowns, avoidance of illegal moves that stress the neck, and early reporting of head and neck symptoms.
For baseball and softball, the primary concern is high-velocity ball contact or collision with other players, which can lead to severe dental injuries and occasional concussions. Pitchers, catchers, infielders, and base runners face particular risk. While helmets with faceguards offer significant facial protection, mouthguards can add a secondary barrier, especially in youth athletes who may not consistently track the ball. Position-specific recommendations may involve encouraging mouthguards for catchers and infielders, where short-distance line drives are more common. As with other sports, equipment-based measures must be integrated with coaching on situational awareness and safe sliding techniques to meaningfully reduce serious head and facial injuries.
Youth sports across all disciplines warrant special consideration. Children and adolescents may have mixed dentition, ongoing orthodontic treatment, and developing craniofacial structures that are more vulnerable to trauma. Mouthguards offer a particularly favorable risk–benefit profile in this group, substantially decreasing dental trauma at relatively low cost and with minimal interference in play when designed and fitted appropriately. Youth leagues should strongly encourage or require their use in any sport with a realistic chance of facial impact, even when concussion evidence is limited. Educational sessions for parents can stress that mouthguards complement, but do not replace, safe coaching, rule enforcement, and prompt removal from play when concussion is suspected.
At the elite and professional level, the calculus can be more complex due to performance concerns, communication needs, and athlete preference. Nonetheless, the financial and career consequences of dental injury are substantial, and there is little downside to wearing well-fitted guards. Team dentists and medical staff can work with athletes to develop custom solutions that minimize bulk, optimize speech and airflow, and integrate with other protective gear such as helmets and visors. Data from impact-monitoring mouthguards, where available, can inform individualized discussions about risk exposure, although these devices are currently more useful for research than for real-time concussion prevention.
For athletes with braces, extensive restorations, or a history of dental trauma, mouthguards are particularly important regardless of sport. Orthodontic appliances can cause severe soft-tissue injuries even from minor impacts, and dental repairs can be expensive and difficult to redo. Custom guards fabricated by a dentist are ideal in these cases, as they can accommodate hardware and distribute forces evenly. Regular adjustments may be needed as orthodontic treatment progresses. Clinicians should explicitly counsel these athletes that because their baseline dental vulnerability is higher, consistent protection is even more critical, and they should not rely on thin, over-the-counter devices alone.
When selecting a mouthguard for any sport, several practical recommendations apply. The device should cover all maxillary teeth fully, extend to the appropriate gum line, and maintain at least the minimum thickness recommended by professional guidelines in critical impact zones, especially the front teeth and occlusal surfaces. It must be retentive enough to stay in place without constant clenching, yet comfortable enough to permit normal breathing and communication. Athletes should be advised to replace guards that are cracked, significantly deformed, or no longer fit due to growth or dental work. Regular inspection and replacement—often at least once per season for youth athletes—help maintain consistent protection.
Coaches, athletic trainers, and sports dentists play key roles in translating research evidence into day-to-day practice. They can provide sport-specific guidance, demonstrate proper fitting for boil-and-bite models, and help athletes choose between off-the-shelf and custom options based on competition level, budget, and individual risk. Importantly, they should frame mouthguards as one component of a comprehensive concussion prevention framework that includes rule modifications, enforcement against dangerous plays, neck and trunk strengthening, technique training that minimizes head-first contact, and stringent protocols for removal from play and medical evaluation after significant impacts.
Across sports, the most consistent message is that mouthguards are strongly justified for their dental and orofacial benefits and may confer limited, context-dependent advantages for concussion risk. Policies and recommendations should reflect this balanced perspective: promoting widespread use where facial impacts are common, encouraging high-quality and custom devices when possible, and avoiding overstated claims about concussion prevention that could foster a false sense of security or detract from other critical safety measures.
Future directions in concussion prevention research
Emerging research is increasingly focused on understanding head trauma at a more granular, mechanistic level so that protective strategies, including the design and use of mouthguards, can be targeted more precisely. One major direction involves improving the measurement of real-world head impacts using wearable technologies. Smart mouthguards, helmet-based sensors, skin patches, and instrumented headgear are being refined to capture not only the magnitude of linear and rotational accelerations, but also their direction, duration, and frequency across an entire season. By linking these objective exposure profiles to clinical outcomes such as diagnosed concussions, symptom trajectories, and neurocognitive performance, researchers hope to identify specific “risk signatures” of impact that are most likely to cause brain injury.
To advance these efforts, there is a push for standardized data collection protocols and shared databases. Currently, studies often use different sensor types, sampling rates, calibration methods, and criteria for what counts as a meaningful impact event. This variability makes it difficult to compare results across teams, sports, and research groups. Large, multi-center collaborations are working to harmonize definitions and methods so that data from smart mouthguards and other devices can be pooled. Such harmonization will make it easier to detect subtle relationships between patterns of exposure and injury, and to evaluate whether specific forms of protection, such as improved mouthguard designs or rule changes, measurably alter those patterns.
Another priority area is the search for objective biomarkers of concussion and brain recovery. While symptom reports and sideline tests remain central, future prevention strategies will likely rely more heavily on blood, saliva, imaging, and electrophysiological markers that can indicate when the brain has truly recovered from an injury—or when it remains vulnerable. Researchers are investigating proteins released into the bloodstream or saliva after brain cell damage, changes in functional and structural MRI, and alterations in brain electrical activity. If reliable biomarkers can be identified, they could help determine safe return-to-play timelines, define thresholds for cumulative risk from repeated impacts, and guide individualized decisions about when additional protective measures are needed.
Wearable technologies and biomarkers are also being combined with advanced analytics and machine learning. By integrating large volumes of data—from impact sensors, neurocognitive tests, symptom logs, and imaging—algorithms may eventually predict which athletes are at highest risk for concussion or prolonged recovery. Early work is exploring whether specific combinations of factors, such as certain impact magnitudes, neck strength profiles, prior injury history, and genetic markers, can identify particularly vulnerable individuals. In the future, this could allow for personalized prevention strategies: athletes could receive tailored conditioning programs, position adjustments, or recommendations for enhanced protection based on their unique risk profile.
On the equipment front, future research is likely to focus on optimizing how different protective devices work together rather than evaluating each in isolation. For mouthguards, this means studying how they interact with helmets, face shields, and other gear in shaping the transmission of forces through the skull, jaw, and cervical spine. Finite element modeling and high-speed impact simulations already allow engineers to test virtual prototypes and analyze how subtle changes in material stiffness, thickness distribution, and jaw positioning influence both orofacial and brain loading. These models will be used to design next-generation mouthguards that balance dental protection with any feasible contribution to reducing head acceleration without sacrificing comfort or performance.
New materials science is also playing a role. Researchers are experimenting with energy-absorbing polymers, layered composites, and structures inspired by nature, such as lattice or honeycomb configurations that can collapse in controlled ways under load. Some of these smart materials can alter their mechanical properties in response to temperature or strain, theoretically allowing a device to remain comfortable at rest but stiffen during an impact to improve energy dissipation. Translating these concepts into practical mouthguards will require careful testing to ensure biocompatibility, durability, ease of cleaning, and stable performance over time in the humid, variable environment of the mouth.
Biomedically, there is increasing interest in the role of neck musculature and neuromuscular control as modifiable factors in concussion risk. Studies suggest that stronger and more responsive neck muscles may help limit head acceleration during unexpected impacts. Future trials are likely to explore training programs that enhance neck strength, proprioception, and anticipatory muscle activation, potentially in combination with oral appliances. Some hypotheses propose that a stable, well-fitted mouthguard might facilitate more efficient jaw and neck muscle engagement, but this needs to be tested in controlled settings that quantify changes in head kinematics during simulated collisions.
Another evolving area is policy and rule-based prevention, informed by more robust epidemiological evidence. As datasets on head impacts and concussions grow, governing bodies can examine how specific rule changes—such as limiting contact in youth practices, restricting certain types of tackles or hits, or modifying game structures—affect both concussion and dental injury rates. Future studies may compare leagues or regions that implement different combinations of rules and equipment mandates, including mouthguard requirements, to determine which frameworks produce the biggest safety gains without fundamentally altering the nature of the sport. This comparative approach can also help disentangle the separate contributions of technique, culture, and equipment to overall injury risk.
Education and behavior change science will remain central to these policy initiatives. Even the best-designed protective equipment is ineffective if not used correctly and consistently. Research in this domain is examining how players, parents, and coaches perceive concussion risk, how marketing claims about gear influence behavior, and which educational strategies actually lead to sustained changes in practice. Future interventions may use interactive digital tools, virtual reality, or personalized feedback derived from sensor data—such as showing an athlete their own impact exposure over a season—to reinforce safe techniques and adherence to recommended protection, including proper mouthguard wear.
Longitudinal cohort studies, following athletes over many years, will be crucial for clarifying the long-term consequences of repeated concussive and subconcussive exposure and for evaluating the cumulative benefits of multi-layered prevention strategies. These studies can track not only head injury histories but also cognitive function, mental health, and quality of life into adulthood and beyond. For mouthguards, the emphasis will likely remain on documenting sustained reductions in dental trauma, but future work may also explore whether chronic patterns of jaw-mediated impacts are associated with particular brain or temporomandibular joint outcomes, and whether specific guard designs influence these trajectories.
Ethical and regulatory questions are also emerging as part of the research landscape. As smart mouthguards and other wearables collect increasingly detailed, individualized impact data, stakeholders must address issues of data ownership, privacy, and the potential for misuse. There is ongoing debate about who should have access to real-time or cumulative impact information—athletes, parents, coaches, medical staff, or governing bodies—and how these data should influence decisions about play eligibility, position assignments, or career longevity. Future concussion prevention frameworks will need to balance the benefits of granular monitoring against the risks of coercion, stigmatization, or over-reliance on numerical thresholds at the expense of clinical judgment.
Research agendas are gradually expanding beyond traditional elite and youth organized sports to include recreational activities, emerging sports, and under-studied populations. Community leagues, informal play, and activities such as skateboarding, cycling, and roller sports may not always use helmets or mouthguards consistently, yet they account for a significant share of head and dental trauma. Understanding the unique patterns of injury, barriers to protection, and cultural attitudes in these settings will be essential for designing inclusive prevention strategies. Future work may explore low-cost, highly accessible mouthguard options, novel outreach methods, and partnerships with schools and community organizations to extend concussion and dental injury prevention far beyond professional stadiums and formal competitions.
