If you’ve ever watched a hockey game, a football matchup, or even a high-intensity basketball tournament, you’ve probably heard someone say, “Put in your mouthguard—don’t get a concussion.” It’s a common belief, and it makes intuitive sense: protect the mouth, protect the head, right?
The reality is a bit more nuanced. Athletic mouthguards absolutely matter for safety, and they’re one of the simplest pieces of protective equipment an athlete can wear. But when it comes to concussions specifically, the research story is complicated—and sometimes misunderstood in locker rooms, on sidelines, and across social media.
This deep dive breaks down what mouthguards are proven to do, what they might do, and what they definitely can’t promise. We’ll also cover how concussions actually happen, why jaw protection is still a big deal, and how to choose a mouthguard that fits your sport and your budget.
Why this question keeps coming up in sports
Concussions are scary because they’re invisible. You can’t always “see” them the way you can see a broken tooth or a split lip. Symptoms can show up later, athletes might underreport them, and even a mild concussion can affect school, work, sleep, mood, and reaction time.
So it’s natural for athletes and parents to look for any layer of protection that could reduce risk. Helmets help in some sports, rule changes help, better coaching helps, and strength/conditioning helps. Mouthguards are part of that conversation because they’re already widely recommended—and in many leagues, required.
Another reason the question persists is that mouthguards clearly prevent certain injuries. When you see a player take an elbow to the face and walk away without broken teeth, it’s easy to assume that same device must also be protecting the brain.
What athletic mouthguards are proven to prevent
Dental trauma: the strongest evidence
The most solid, consistent evidence supports mouthguards for preventing injuries to teeth and the soft tissues of the mouth. That includes chipped or fractured teeth, knocked-out teeth, cuts to the lips and cheeks, and some types of gum trauma.
This is not a small benefit. Dental injuries can be expensive, painful, and emotionally upsetting—especially for kids and teens. Treatment can involve emergency visits, root canals, crowns, implants, and long-term follow-ups. A well-fitting mouthguard can be the difference between “that hurt” and “that changed my life.”
Even in sports that don’t look like “contact sports,” collisions happen: basketball rebounds, soccer headers gone wrong, accidental stick contact in lacrosse or field hockey, and falls in skateboarding or gymnastics.
Jaw and soft-tissue protection that people don’t talk about enough
Mouthguards also help cushion the jaw and reduce the chance of lacerations inside the mouth. When you get hit, your own teeth can become sharp edges that cut your lips and cheeks from the inside. A mouthguard acts like a barrier and shock absorber.
They may also reduce the risk of certain jaw injuries by helping distribute force and by keeping the jaw from slamming together with full intensity. That matters because jaw injuries can affect eating, speaking, sleep, and overall comfort for a long time.
All of this is to say: even if mouthguards didn’t have any relationship to concussion risk at all, they’d still be worth wearing for many athletes.
How concussions actually happen (and why that matters for mouthguards)
The brain moves inside the skull
A concussion is a type of mild traumatic brain injury that typically happens when a force causes the brain to accelerate and decelerate rapidly inside the skull. That force can come from a direct hit to the head, but it can also come from a blow to the body that whips the head around.
That’s why you can get a concussion without being “hit in the head.” Think of a hard tackle that snaps the head back, or a fall where the body stops suddenly but the head keeps moving.
The key point: concussions are about brain motion and brain tissue strain, not just about facial injuries or teeth clacking together.
Rotational forces are a big part of the problem
Researchers increasingly emphasize rotational acceleration—twisting forces—as a major contributor to concussion risk. Rotational forces can stretch and shear brain tissue more than straight-line impacts in many cases.
This matters because a mouthguard mainly sits in the mouth and interacts with the jaw. It doesn’t control how the head rotates after impact, and it doesn’t stabilize the neck. That’s one reason why mouthguards aren’t considered a primary concussion-prevention tool the way, say, rule enforcement or limiting head contact in practice can be.
That said, the jaw is connected to the skull, and the skull houses the brain. So it’s fair to ask whether changing how forces travel through the jaw could influence what the brain experiences. That’s exactly what researchers have been exploring.
So… do mouthguards prevent concussions? The research in plain language
What the overall evidence suggests
When you look across studies, the most responsible summary is: mouthguards are clearly effective for dental protection, but the evidence that they prevent concussions is mixed and not strong enough to make a guarantee.
Some studies have found lower concussion rates among mouthguard users, while others have found no meaningful difference. There are also challenges in study design: athletes who wear mouthguards may differ in other ways (coaching, safety culture, playing style), and concussion reporting can vary widely.
It’s also hard to isolate the effect of mouthguards because many sports have multiple protective measures at once—helmets, face shields, rule changes, and evolving medical protocols.
Why early claims sounded more confident than today’s messaging
Decades ago, there were theories that mouthguards could reduce concussion risk by cushioning the jaw, preventing the mandibular condyle from driving into the base of the skull, or by reducing jaw clench at impact. Some early observational reports seemed to support this idea.
But as concussion science matured, researchers became more careful about separating correlation from causation. Better-designed studies and systematic reviews often conclude that while a protective effect is possible, it’s not consistently demonstrated.
In other words: it’s not that mouthguards “do nothing” for concussions. It’s that the current body of evidence doesn’t let us say, “Wear a mouthguard and you won’t get concussed,” or even “Wear one and your risk is definitely lower.”
What mouthguards might do for concussion risk (the plausible mechanisms)
Reducing jaw impact and bite force
One plausible mechanism is that a mouthguard can reduce the force transmitted when the lower jaw is driven upward during a hit. If the jaw slams into the upper jaw with less intensity, that could theoretically reduce some component of force transfer to the skull.
Some athletes also clench their jaw during play. A mouthguard can change the way clenching loads the jaw joints and teeth, potentially affecting how forces are distributed during impact.
However, plausible doesn’t mean proven. The head can still whip, rotate, and experience acceleration even if the teeth are protected.
Improving neuromuscular readiness (a “maybe” area)
You might hear claims that mouthguards improve posture, breathing, or neuromuscular control and therefore reduce concussion risk. There’s a lot of marketing in this area, and the science isn’t settled.
Some athletes report feeling more stable or “locked in” with certain designs. That subjective experience can be real for the athlete, but it’s not the same as evidence that concussion rates drop in a measurable way.
If you’re evaluating these claims, look for independent research, not just manufacturer-funded studies or testimonials.
Why the “type” and “fit” of mouthguard still matters a lot
Stock vs boil-and-bite vs custom: what changes in real life
Not all mouthguards are created equal. Stock mouthguards are pre-formed and often bulky. Boil-and-bite mouthguards can be molded at home, which is better than stock for many athletes. Custom mouthguards are made from an impression or scan of your teeth for a more precise fit.
For dental injury prevention, fit matters because a loose guard can shift on impact, leaving teeth exposed or reducing cushioning. Comfort matters too: if it’s uncomfortable, athletes “forget” to wear it, chew it up, or take it out during key moments.
And while the concussion link is uncertain, if there is any potential protective effect, it would likely depend on consistent use and proper fit. A mouthguard sitting half-out of the mouth can’t do much of anything.
Breathing and communication are not small details
Athletes need to breathe hard and talk quickly—calling plays, communicating on defense, or responding to a coach. If a mouthguard makes that difficult, compliance drops.
That’s one reason custom guards are popular with serious athletes: they’re typically less bulky, stay in place, and allow better speech and airflow. A mouthguard that feels “natural” is the one that actually gets worn.
So even if your primary goal is concussion prevention (again: not guaranteed), the practical pathway is the same—get something you’ll wear every time.
Sports where mouthguards are essential (and where people skip them anyway)
High-contact sports: obvious, but worth repeating
Football, hockey, lacrosse, rugby, martial arts, boxing, and wrestling have clear collision and impact risks. Mouthguards are a baseline safety tool here, the same way shin guards are in soccer.
In these sports, dental trauma risk is high enough that even a “perfect helmet” wouldn’t solve the problem. Sticks, elbows, gloves, boards, and accidental headbutts all happen fast.
If you’re choosing where to spend safety dollars, a well-fitting mouthguard is one of the most cost-effective purchases you can make.
“Medium-contact” sports: the sleeper category
Basketball, soccer, baseball/softball, mountain biking, skateboarding, and even cheerleading can involve sudden collisions, falls, and unpredictable impacts. Mouthguards are less consistently worn, but dental injuries still occur.
In soccer, for example, collisions during headers can lead to tooth fractures. In basketball, an elbow to the face is almost a rite of passage. In baseball, a bad hop or a thrown ball can change everything in a split second.
Many athletes in these sports only start wearing a mouthguard after an injury. It’s much nicer to start before the lesson is learned the hard way.
What to look for in a mouthguard if you care about both safety and comfort
Retention: it should stay put without biting down
A good mouthguard should stay in place when you open your mouth. If you have to bite constantly to keep it seated, you’ll fatigue your jaw and you’re more likely to spit it out during play.
Retention is also part of protection. On impact, a guard that dislodges can expose teeth and reduce cushioning right when you need it.
If you’re using a boil-and-bite, take the fitting process seriously—follow the time and temperature instructions and re-mold if it doesn’t fit well.
Thickness and coverage: enough to protect, not so much you can’t function
Generally, you want adequate thickness over the biting surfaces and good coverage of the teeth and gums. Too thin and it won’t absorb much force; too thick and it becomes uncomfortable and interferes with breathing and speech.
Different sports may benefit from different designs. For example, a grappling sport might call for a different balance of thickness and retention than a running-heavy field sport.
Ask your dentist or a sports dentistry provider what they recommend for your specific sport and age group.
Material quality and durability: it shouldn’t look shredded in a month
If your mouthguard starts tearing, hardening, or deforming, replace it. A worn guard may not fit properly, and rough edges can irritate the gums and cheeks.
Kids and teens also need replacements more often because their teeth are shifting and they’re growing. A guard that fit last season may be a poor fit now.
Cleaning matters as well—rinse after use, clean regularly, and store it in a ventilated case.
How to talk about mouthguards and concussions without overpromising
A better message for athletes and parents
Instead of “mouthguards prevent concussions,” a more accurate message is: mouthguards prevent many mouth and tooth injuries, and they may or may not reduce concussion risk—but they’re still worth wearing.
This matters because overpromising can backfire. If an athlete gets concussed while wearing a mouthguard, they may feel misled and stop using it altogether, increasing their risk of dental injury next time.
Clear expectations help people stick with good habits. Mouthguards are a strong “yes” for oral protection, and a “maybe” for concussions.
Pair mouthguards with strategies that really do reduce concussion risk
If you want to reduce concussion risk, focus on what the evidence consistently supports: enforcing rules against head contact, teaching safe technique, strengthening the neck and trunk, improving balance and reaction, limiting high-impact drills in practice, and ensuring honest reporting and proper return-to-play protocols.
Mouthguards fit into this as part of an overall safety system, not as a magic shield.
That’s also why coaches and leagues should avoid using mouthguards as a reason to allow more aggressive play. Protective gear is not permission to take bigger risks.
Common myths that keep circulating
Myth: “If you wear a mouthguard, you can’t get a concussion”
This is the big one, and it’s simply not supported. You can absolutely get concussed while wearing a mouthguard, just like you can get concussed while wearing a helmet.
Protective equipment reduces certain risks; it doesn’t eliminate them. Concussions involve complex forces and individual factors like history of prior concussions, fatigue, and the specifics of each impact.
If you’re wearing a mouthguard, keep wearing it—but don’t let it create a false sense of invincibility.
Myth: “Any mouthguard is basically the same”
Fit, material, and design influence comfort and whether the guard stays in place. A cheap guard that sits loosely and makes breathing difficult is less likely to be worn consistently, and it may provide less protection.
For some athletes, boil-and-bite is a good middle ground. For others—especially those in high-contact sports or those with braces or unique bite issues—custom can be a game changer.
Think of it like footwear: any shoe is better than no shoe on a rocky trail, but the right shoe makes a big difference in performance and injury prevention.
Choosing a provider: why sports dentistry is its own niche
Customization isn’t just about comfort—it’s about predictable protection
When a mouthguard is designed around your bite, it’s easier to get consistent thickness where it matters and a secure fit that doesn’t require constant clenching. That can improve the real-world protection you get during unpredictable play.
Sports dentistry providers also think about the specific risks of your sport, your age, and your dental history. Someone who’s had prior dental trauma or orthodontic work may need a different approach than someone with a stable adult bite.
If you’re exploring options and want a sense of what dedicated sports mouthguard services look like, you can check out Philadelphia athletic mouthguards as an example of the kinds of considerations providers walk you through (sport type, fit, durability, and comfort).
Orthodontics, mixed dentition, and special cases
Braces and changing teeth can complicate mouthguard fit. A guard that’s too tight can get stuck; one that’s too loose can shift. Some designs are made to accommodate brackets and tooth movement, but they still need to be monitored and replaced as the mouth changes.
For younger athletes, growth spurts can change fit quickly. It’s smart to reassess each season, especially if the guard starts feeling tight or if the athlete is chewing on it constantly (a sign of discomfort or poor fit).
And if an athlete has a history of jaw pain or TMJ issues, it’s worth discussing mouthguard design carefully so it doesn’t aggravate symptoms.
What happens if you take a hit while wearing a mouthguard
Don’t assume “no blood” means “no injury”
A mouthguard can prevent cuts and tooth fractures, which is great—but it can also remove visible clues that an impact was serious. An athlete may feel “fine” because they’re not dealing with a bleeding lip or a broken tooth, yet still have concussion symptoms developing.
After a significant hit, pay attention to headache, dizziness, nausea, light sensitivity, confusion, or feeling “off.” If symptoms show up, follow concussion protocols and get evaluated.
Mouthguards are protective, but they don’t replace medical assessment.
Check the mouthguard itself
After a big impact, inspect the mouthguard for tears, cracks, or deformation. If it’s damaged, replace it. A compromised guard may not perform the same way again.
Also check for tooth soreness, looseness, or bite changes. Sometimes dental injuries aren’t obvious right away, especially if adrenaline is high.
If anything feels unusual—pain when biting, a tooth that feels “high,” or jaw discomfort—book a dental evaluation.
For athletes: practical tips to actually wear it every time
Make it part of your routine, not an accessory
The biggest benefit comes from consistent use. Treat your mouthguard like your seatbelt: you put it on automatically, not only when you “think you’ll need it.” Most injuries happen during unexpected moments.
Keep it in a ventilated case in your gear bag, and have a backup if you’re the type to misplace things. If you’re on a team, consider labeling your case—mouthguards all look the same in a locker room.
If you find yourself taking it out to talk, your fit may be the issue. A better-fitting guard can solve that.
Keep it clean so it doesn’t become gross
One underrated reason people stop wearing mouthguards is that they start to smell or feel slimy. Rinse after each use, clean regularly, and let it dry in a case that allows airflow.
Avoid leaving it in a hot car or in direct sun, which can warp the material. A warped mouthguard is basically a new mouthguard waiting to happen.
If you’re prone to losing it, build a habit: mouthguard goes in the case immediately after play, every time.
How this connects to everyday dentistry (yes, even cosmetic stuff)
Protecting your smile isn’t only about game day
Sports injuries can have a long tail. A chipped front tooth can become a bigger restoration later, and repeated trauma can affect tooth vitality. If you’ve invested time or money into your smile, prevention becomes even more valuable.
Some people explore cosmetic options after chips, wear, or uneven edges—sometimes caused or worsened by sports impacts. If you’re curious about conservative cosmetic approaches that can improve appearance with minimal tooth reduction, no prep veneers are one example of a treatment people ask about when they want a more natural-looking enhancement.
Of course, the goal is to avoid needing any repair in the first place—another reason mouthguards are such an easy win for athletes.
Severe trauma can affect more than teeth
In higher-impact incidents, athletes can experience tooth loss or damage that makes chewing difficult. These situations can be emotionally tough and can affect nutrition and confidence.
Modern dentistry has several ways to restore function and aesthetics. In urgent cases where someone needs a fast solution for missing teeth, same day dentures can be part of a treatment pathway, depending on the clinical situation.
Again, no one wants to be in that position—so it’s worth stacking the odds in your favor with prevention, good coaching, and appropriate protective gear.
What researchers would love to study next (and why it’s hard)
Better data, better reporting, clearer comparisons
One challenge in concussion research is that reporting isn’t consistent. Some athletes hide symptoms to keep playing, and some teams have stronger medical oversight than others. That makes it hard to compare concussion rates across groups.
Another issue is that mouthguard use isn’t always tracked accurately. “Wears a mouthguard” can mean anything from “always” to “sometimes” to “only during games.” Those differences matter.
Future studies that track compliance, mouthguard type, fit, and verified concussion diagnosis would help clarify whether certain designs offer measurable benefits.
Sensor-equipped mouthguards: promising, but not the final answer
You may have heard of mouthguards with impact sensors. These can collect data on hits, which is interesting for research and potentially useful for monitoring exposure.
But a sensor reading doesn’t equal a concussion diagnosis. Concussions depend on symptoms, clinical evaluation, and individual response, not just a single number from a device.
Still, better measurement tools could help researchers understand the relationship between impacts, jaw forces, and head motion more clearly over time.
Key takeaways you can actually use this week
If you play a sport with any collision risk, wear a mouthguard
Even though the science doesn’t let us promise concussion prevention, mouthguards are strongly supported for preventing dental and soft-tissue injuries. That alone is enough reason to wear one consistently.
If you’re choosing between “sometimes” and “always,” go with always. Injuries don’t schedule themselves for convenient moments.
And if you’re a parent, treat the mouthguard like any other required piece of equipment—not an optional add-on.
Pick the mouthguard you’ll actually keep in your mouth
The best mouthguard is the one that fits well, feels comfortable, and stays in place without effort. For some athletes, that’s a well-molded boil-and-bite. For others, it’s custom.
If your current guard makes you gag, struggle to breathe, or talk like you’ve got a mouth full of marbles, don’t just tolerate it—upgrade it. Comfort drives compliance, and compliance drives protection.
And remember: mouthguards are one layer. Real concussion risk reduction comes from safe play, smart coaching, strong medical protocols, and a culture that takes head injuries seriously.