Mouthguard Concussion Research: The 2026 Evidence Map

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Peer-reviewed mouthguard-and-concussion research is real, mixed, and improving. The strongest single source is the 2023 BJSM meta-analysis of 192 studies, which found a 26% reduction in concussion incidence in collision sports for athletes wearing mouthguards1. Earlier reviews concluded the evidence was insufficient23, and the picture has evolved as more controlled trials have published. Custom mandibular-stabilization appliances — the lower-jaw mechanism family NeuroGuard+ belongs to — have their own controlled-trial signal456 that is encouraging but methodologically caveated. This page maps the literature so athletic trainers, parents, and program directors can weigh what's published against what's marketed.

The mouthguard-and-concussion literature has three layers — read them in order

The published literature on mouthguards and concussion sits on three layers, and any honest evaluation reads them in order rather than cherry-picking one. Layer one is the meta-analytic and systematic-review evidence: pooled findings across many studies, which absorb the noise of any single trial and surface the population-level signal. The 2023 British Journal of Sports Medicine meta-analysis of 192 studies is the strongest current source in this layer1. Layer two is the controlled-trial evidence on specific appliance designs, where the mandibular-stabilization mechanism NeuroGuard+ is built around shows the most direct support456. Layer three is mechanism-and-physiology research — airway, neuromuscular, performance — that explains why a custom mandibular appliance might influence concussion incidence at all78910.

Counter-evidence belongs in the read, not as a footnote. The 2011 Clinics in Sports Medicine review concluded there was no evidence that standard or fitted mouthguards decrease concussion incidence2. The 2009 BJSM systematic review reached a similar conclusion3. Both pre-date the more recent meta-analyses and the controlled trials on custom mandibular designs, but they remain in the literature and any evaluation that doesn't acknowledge them is incomplete. The honest framing — and the FTC-defensible framing — is that the evidence has evolved, that custom mandibular appliances appear stronger than retail mouthguards on the available data, and that no published source supports a "prevents concussions" claim. Reduces incidence in collision sports is the language the meta-analysis used1. That is the language we use.

Meta-Analyses: The Top of the Evidence Pyramid

Meta-analyses pool findings across many primary studies to estimate the population-level effect of an intervention. They sit at the top of the evidence hierarchy because they absorb the noise of any single trial. The most consequential mouthguard-and-concussion meta-analysis is Eliason et al. 2023, published in the British Journal of Sports Medicine: 192 included studies, registered systematic review (PROSPERO CRD42019152982), incidence rate ratio of 0.74 (95% CI 0.64–0.89) for mouthguards in collision sports — a 26% reduction in concussion incidence, statistically significant1. This is the strongest single source in the published literature, and it is the source that should anchor any honest evaluation of the category. A second meta-analysis, Knapik et al. 2019 in Sports Medicine (26 studies), is the strongest source for the orofacial-injury reduction case, which is a more conservative and well-established claim11. For deeper analysis of what these meta-analyses actually say and how they should be cited in conversations with parents, athletic trainers, and program directors, see our deep dive on whether mouthguards prevent concussions.

Custom Mandibular Trials: Where the Lower-Jaw Mechanism Has Direct Evidence

The NeuroGuard+ mechanism family — custom mandibular-stabilization appliances — has three direct controlled trials in the published literature. Hutchison 2018 is a 4,010-player retrospective cohort of athletes wearing a custom mouthguard that places the mandible in the Mandibular Physiologic Rest Position; the cohort concussion rate was 0.224% (9 concussions across 4,010 players), with a controlled high-school comparison subset showing 1.16% incidence in the MPRP group vs 15.5% in controls4. Winters & DeMont 2014 randomized 412 high-school football players between custom pressure-laminated mouthguards (≥3mm posterior thickness) and over-the-counter mouthguards: 3.6% concussion incidence in the custom group vs 8.3% in the OTC group, p=0.04235. Singh 2009 followed 28 high-school and college football players before and after deployment of a customized mandibular orthotic; concussion events fell from 2.1 ± 1.4 per player pre-deployment to 0.11 ± 0.3 post-deployment6. Each of these studies has methodological caveats the authors disclose — Hutchison is retrospective and inventor-affiliated, Singh is small and self-reported pre-deployment, the Winters trial is not blinded — and Daneshvar's 2011 review specifically critiqued the Singh design2. We cite the caveats alongside the findings on every page that uses these numbers. The deeper mechanism walk-through lives on how mouthguards reduce concussion risk and the head-to-head trial data on custom vs boil-and-bite.

Counter-Evidence: The Reviews That Cut Against the Case

Two systematic reviews in top-tier journals have concluded that the evidence for mouthguard-mediated concussion reduction is insufficient, and any honest evaluation cites them. Daneshvar et al. 2011 in Clinics in Sports Medicine reviewed the available literature and wrote: "Although mouth guards have been shown to be effective in preventing dental and orofacial injury, there is currently no evidence that standard or fitted mouth guards decrease the rate or severity of concussions in athletes"2. Benson et al. 2009 in the British Journal of Sports Medicine (51 studies) reached the parallel conclusion that "no strong evidence exists for the use of mouthguards or face shields to reduce concussion risk"3. Both reviews pre-date the 2023 BJSM meta-analysis1 and the controlled trials on custom mandibular designs456, and the literature has clearly evolved since they published — but the reviews remain in the record, the FTC has sent warning letters to mouthguard manufacturers for unsupported concussion-prevention claims, and the responsible framing on a brand page is to cite both directions of evidence and let the reader weigh them.

Daneshvar 2011 also recorded specific findings that cut against retail mouthguard claims: 1,033-NHL-athlete data showing no statistically significant concussion-incidence difference between mouthguard wearers and non-wearers (relative risk 1.42, 95% CI 0.90–2.25); Wisniewski 2004 finding no statistically significant difference between mouthguard types in 87 NCAA D1 football teams; LaBella 2002 finding no significant difference in college basketball2. We cite Daneshvar on every page that touches a concussion claim — that is what makes our supportive citations credible.

Mechanism Studies: Why a Custom Mandibular Appliance Might Plausibly Affect Concussion Incidence

The mechanism literature explains how a custom mandibular-stabilization appliance might influence the impact-force pathway that reaches the brain. Three lines of research are relevant. Airway dynamics: Garner & McDivitt 2009 (N=10) measured a 9% increase in upper-airway width during mouthpiece use (28.27 vs 25.93 mm, P=0.029) along with reduced post-exercise lactate (1.86 vs 2.72 mmol/L)8. Garner & Lamira 2020 (N=17, randomized cross-over) measured an 8.4% reduction in respiratory rate during steady-state aerobic exercise with a lower-jaw genioglossal-effecting custom appliance, and a 5.3% reduction in minute ventilation (both p<0.01), with no change in oxygen consumption7. Neuromuscular and performance physiology: Haughey & Fine 2020 measured 5.8% / 10% / 14% / 4.8% gains in lower-body power, upper-body power, hamstring flexibility, and balance respectively in 15 elite athletes wearing a custom mouthguard placing the lower jaw in physiological rest position vs habitual bite (all p<0.05)9. The authors hedged on generalization given the small sample, and we cite their hedging. Adjacent biomechanics: Collins 2014 (N=6,704 high-school athletes) found that every 1-pound increase in neck strength was associated with a 5% reduction in concussion odds — a finding that frames mandibular stabilization as one component of a broader head-neck stabilization story rather than a standalone mechanism10. The full mechanism walk-through lives on how mouthguards reduce concussion risk and jaw alignment and athletic performance.

Adjacent Equipment Research: What the Helmet, Headband, and Cap Literature Says

The mouthguard literature does not exist in isolation. Adjacent equipment categories — helmets, soft-shell headbands, and helmet covers like the NFL Guardian Cap — have their own evidence bases that any program-level evaluation should weigh. The Guardian Cap NXT data is the most current adjacent reference: NFL preseason data shows a 54–62% reduction in overall concussion incidence with required Guardian Cap use, and per-cap force absorption of approximately 11–12% of impact force (~20% if both colliding players are wearing them)12. A 2,610-player University of Wisconsin–Madison high school study found no effect of Guardian Caps on concussion rates at the HS level — the NFL findings did not generalize cleanly to the high-school context, suggesting the protective effect is not purely a function of energy absorption12. The implication is that internal biomechanical factors — jaw stabilization, neck strength, athlete-by-athlete physiology — likely contribute meaningfully to whatever protective effect exists across the equipment stack. The deeper comparison lives on our NeuroGuard+ vs Guardian Cap page. The category overview, including how each equipment family fits into a multi-layer protection stack, is on the concussion protection buyer's guide.

Youth Brain Risk: The Evidence on Why It's Different in Developing Athletes

Youth-brain concussion research is a category of its own. The CDC's HEADS UP data places national 12-month sport- or recreation-related TBI incidence in children 5–17 at 6.9%13, and the underlying MMWR data places self-reported sport-related concussion prevalence in US high-school students at 15.1%13. Hutchison 2018 used those CDC anchors to contextualize the 0.224% rate in their MPRP cohort4. Beyond incidence, two structural points make youth concussion research distinct: developing brains have different cerebrovascular reactivity and metabolic profiles than adult brains, which is the proposed mechanism behind second impact syndrome — a syndrome documented almost exclusively in adolescent athletes — and the standard-of-care return-to-play protocol from the CISG Amsterdam 2022 consensus is calibrated specifically for these developmental considerations14. The deeper youth-brain explainer lives on second impact syndrome. For sport-specific youth contexts, see best mouthguard for youth football and best mouthguard for hockey.

FDA Clearance, Virginia Tech Ratings, and Peer Review Are Not the Same Thing

A common buyer mistake is treating "FDA clearance," "Virginia Tech rating," and "peer-reviewed evidence" as interchangeable signals of quality. They are not. FDA 510(k) clearance establishes that a device is substantially equivalent to a predicate device for a regulated medical use; it is a regulatory pathway, not an efficacy verdict, and the cleared indications are narrowly written. The Q-Collar holds FDA clearance for a specific indication; that clearance does not establish that the device prevents concussions in the way marketing language sometimes implies, and it does not by itself out-rank a peer-reviewed meta-analysis showing population-level incidence reduction. Virginia Tech helmet ratings are an independent star-rating system run by the VT Helmet Lab against a defined laboratory impact test; they are useful for differentiating helmets within the rated category, but they do not measure concussion outcomes in vivo, they do not measure rotational acceleration in the way the field has moved toward, and they do not extend to mouthguards or other intraoral appliances. Peer-reviewed evidence — published in indexed journals, registered systematic reviews, controlled trials with disclosed methods — is the layer that meta-analyses synthesize. The 2023 BJSM meta-analysis1 sits in the peer-reviewed layer; an FDA clearance does not, even when the cleared device has its own peer-reviewed publications.

The athletic-trainer-grade rule of thumb: if a vendor's strongest evidence claim is a regulatory clearance or a third-party rating, ask what peer-reviewed efficacy data sits underneath it. Both can coexist (as with the Q-Collar's FDA clearance plus its peer-reviewed publication record), but neither alone is a substitute for the other. NeuroGuard+ does not hold FDA clearance and does not appear in the Virginia Tech ratings (which do not cover mouthguards). What it does have is a peer-reviewed evidence base — Eliason 20231, Hutchison 20184, Winters 20145, Singh 20096, plus the mechanism literature789 — and the FTC-compliant framing that the supporting reviews23 also need to be read.

The 2026 Concussion-Prevention Vendor Evidence Scorecard

This is a meta-evaluation: which vendors have published, peer-reviewed efficacy data, and what does that data actually claim? The scorecard does not rank protective effect — that requires head-to-head trials that mostly do not exist. It ranks evidence transparency, which is what athletic trainers and program directors should be assessing in a vendor RFP.

Vendor / Category Mechanism Peer-Reviewed Efficacy Data Regulatory Status Counter-Evidence Cited? What's Missing
NeuroGuard+ (custom mandibular) Mandibular-stabilization, lower-jaw appliance Multiple sources for the mechanism family: Eliason 20231, Hutchison 20184, Winters 20145, Singh 20096, plus mechanism studies789 None (custom dental appliance, no FDA pathway claimed) Yes — Daneshvar 20112 and Benson 20093 cited on every page that touches a concussion claim A NG+-specific RCT (vs the broader mechanism family of custom mandibular appliances)
Q-Collar (Q30 Innovations) Jugular-vein compression, increases cranial blood volume Multiple peer-reviewed publications on the compression mechanism FDA-cleared (2021) for a specific indication Limited counter-evidence framing on consumer-facing pages Independent replication outside the original research group
Guardian Cap (Guardian Sports) External impact-energy absorption (helmet cover) NFL preseason data (54–62% concussion-incidence reduction, AJSM publication)12; HS counter-evidence (UW Madison, N=2,610)12 Not a regulated medical device Mixed — NFL data cited; HS counter-data less prominent Mechanism transparency on why the NFL effect did not reproduce at HS level
Storelli / GameBreaker / Unequal (soft-shell headgear) External impact-energy absorption (foam/D3O padding) Lab-test data and Virginia Tech-style ratings; field-trial concussion-incidence data is limited Not regulated medical devices Not generally cited in marketing Field RCTs measuring concussion outcomes in target sports
Prevent Biometrics (instrumented mouthguards) Impact measurement (does not modify impact) Validation studies for measurement accuracy FDA clearance for measurement claims Vendor is transparent that the device measures impact rather than reducing it Not a prevention product — pairs with prevention but does not replace it
Retail boil-and-bite mouthguards Dental injury reduction Knapik 201911 supports orofacial-injury reduction; concussion-incidence data is mixed-to-null per Daneshvar 20112 Not regulated for concussion claims Rarely Concussion-prevention claims that exceed the available evidence are an FTC-warning-letter category

The pattern this scorecard surfaces: every category has a defensible claim and a real limitation, and most marketing language overstates the defensible claim and omits the limitation. The trainer-grade move is to ask each vendor (a) what peer-reviewed efficacy data they have, (b) what counter-evidence they cite, and (c) where the gaps are. Any vendor that cannot answer (b) is selling marketing rather than protection.

What Athletic Trainers and Program Directors Should Require From Any Concussion-Protection Vendor

This is the trainer-grade evaluation framework. A vendor should be able to produce, on request: (1) a list of peer-reviewed publications supporting the mechanism, with PMID or DOI links and identification of which are independent vs vendor-affiliated; (2) a statement of the cited counter-evidence and how the vendor frames it for FTC compliance — vendors who do not cite counter-evidence are taking on regulatory and credibility risk you will inherit when you deploy the product to your athletes; (3) the regulatory status of the device (FDA clearance, ASTM testing, governing-body approval) with the cleared or tested indication stated specifically rather than vaguely; (4) an athlete-acceptance and compliance plan — a 26% incidence reduction at 100% compliance is a 13% reduction at 50% compliance, which is what most equipment programs see in practice; (5) sport-specific compatibility documentation — helmet interaction, facemask clearance, governing-body rule fit; and (6) a per-athlete cost-of-ownership figure including replacement cycle, fitting workflow, and any institutional discount structure.

The CISG Amsterdam 2022 consensus statement14 sets the standard-of-care framework that NCAA, NFHS, USA Hockey, US Lacrosse, and equivalent international bodies adopt for concussion management. Equipment recommendations sit alongside that consensus, not on top of it. A protection program that has good equipment and bad return-to-play protocols is not a concussion-prevention program; a program that has good return-to-play protocols and unevaluated equipment is incomplete. The framework above is meant to fit into the broader CISG-aligned program, not to replace it. NeuroGuard+ team programs are designed around exactly this framework — peer-reviewed mechanism, cited counter-evidence, governing-body rule compatibility, sport-versatile compliance — and we publish the evidence rather than abstracting it behind "research suggests."

Frequently asked questions

What is the strongest single source on mouthguards and concussions?

Eliason et al. 2023, published in the British Journal of Sports Medicine, is the strongest single source. It is a registered systematic review and meta-analysis (PROSPERO CRD42019152982) of 192 included studies and reports an incidence rate ratio of 0.74 (95% CI 0.64–0.89) for mouthguards in collision sports — a 26% reduction in concussion incidence, statistically significant1. Any vendor citing concussion-prevention evidence should anchor on this source or explain why they are anchoring elsewhere.

Why do older reviews say mouthguards do not reduce concussions?

Daneshvar et al. 2011 in Clinics in Sports Medicine and Benson et al. 2009 in the British Journal of Sports Medicine both concluded the evidence was insufficient at the time they published23. Those reviews pre-date the 2023 BJSM meta-analysis1 and several controlled trials on custom mandibular designs456. The literature has clearly evolved, but the older reviews remain in the record and should be cited alongside the newer findings. We cite Daneshvar on every page that touches a concussion claim. That is what makes our supportive citations credible and what keeps our claims FTC-compliant.

Is the evidence base different for custom mouthguards vs retail boil-and-bite?

Yes. Knapik 201911 supports orofacial-injury reduction broadly across mouthguard types. The concussion-incidence evidence diverges by appliance type: custom pressure-laminated and custom mandibular designs show stronger signals (Winters 2014, Hutchison 2018, Singh 2009) than retail boil-and-bite mouthguards456, and Winters specifically found a statistically significant 3.6% vs 8.3% concussion incidence in 412 high-school football players randomized between custom-laminated and OTC mouthguards (p=0.0423)5. Our deep dive on this comparison is the custom vs boil-and-bite mouthguards page.

Does FDA clearance mean a product prevents concussions?

No. FDA 510(k) clearance establishes that a device is substantially equivalent to a predicate device for a specifically written indication; it is not an efficacy verdict for concussion prevention in general. The Q-Collar holds FDA clearance for a specific indication, and the supporting peer-reviewed publications describe the cleared mechanism — that is a different thing than "FDA-cleared as a concussion preventer." Buyers and athletic trainers should read the cleared indication carefully and compare it to peer-reviewed efficacy data, which is the layer where meta-analyses live.

What evidence does NeuroGuard+ specifically have?

NeuroGuard+ is a custom mandibular-stabilization appliance — a lower-jaw mechanism family that has direct controlled-trial evidence in the published literature: Hutchison 2018 (4,010 players, custom MPRP design)4, Winters & DeMont 2014 (412 HS football players, custom pressure-laminated design)5, and Singh 2009 (28 players, customized mandibular orthotic)6. The mechanism literature includes the airway studies (Garner & McDivitt 2009; Garner & Lamira 2020)87 and the performance physiology study (Haughey & Fine 2020)9. The 2023 BJSM meta-analysis1 sits at the top of the evidence pyramid for the broader category. We cite the counter-evidence (Daneshvar 20112, Benson 20093) on every page that touches a concussion claim. A NeuroGuard+-specific RCT would strengthen the case further; we do not have one yet, and we say so.

How should an athletic trainer or program director use this evidence map?

Use it as the basis for a vendor-evaluation framework. Ask each prospective vendor what peer-reviewed publications support their mechanism, what counter-evidence they cite, and where the gaps are. Vendors who can answer all three are running a credible program; vendors who can answer only the first are running a marketing pitch. Pair the equipment evaluation with a CISG Amsterdam 202214 return-to-play protocol — protection equipment and post-injury management are complementary, not substitutes — and document both layers in your program's standard-of-care file.

References

  1. 1. Eliason PH, Galarneau JM, Kolstad AT, et al. Prevention strategies and modifiable risk factors for sport-related concussions and head impacts: a systematic review and meta-analysis. British Journal of Sports Medicine. 2023;57(12):749-761. doi:10.1136/bjsports-2022-106656
  2. 2. Daneshvar DH, Baugh CM, Nowinski CJ, McKee AC, Stern RA, Cantu RC. Helmets and Mouth Guards: The Role of Personal Equipment in Preventing Sport-Related Concussions. Clinics in Sports Medicine. 2011;30(1):145-163. doi:10.1016/j.csm.2010.09.006
  3. 3. Benson BW, Hamilton GM, Meeuwisse WH, McCrory P, Dvorak J. Is protective equipment useful in preventing concussion? A systematic review of the literature. British Journal of Sports Medicine. 2009;43(Suppl 1):i56-i67. doi:10.1136/bjsm.2009.058271
  4. 4. Hutchison DD, Madura C, Hutchison MC. Impact of an improved mandibular rest position via custom mouth guard on the incidence of concussions in athletes. Michigan State University College of Human Medicine; Helen DeVos Children's Hospital; 2018. Note: corresponding author Dr. Michael Hutchison invented the studied appliance. manuscript PDF
  5. 5. Winters JE Sr, DeMont R. Role of mouthguards in reducing mild traumatic brain injury/concussion incidence in high school football athletes. General Dentistry. 2014;62(3):34-38.
  6. 6. Singh GD, Maher GJ, Padilla RR. Customized mandibular orthotics in the prevention of concussion/mild traumatic brain injury in football players: a preliminary study. Dental Traumatology. 2009;25(5):515-521. doi:10.1111/j.1600-9657.2009.00808.x
  7. 7. Garner DP, Lamira J. Respiratory outcomes with the use of a lower custom fit genioglossal-effecting oral appliance. Clinical and Experimental Dental Research. 2020;6(1):100-106. doi:10.1002/cre2.254
  8. 8. Garner DP, McDivitt E. Effects of mouthpiece use on airway openings and lactate levels in healthy college males. Compendium of Continuing Education in Dentistry. 2009;30 Spec No 2:9-13. PMID:19774773
  9. 9. Haughey JP, Fine P. Effects of the lower jaw position on athletic performance of elite athletes. BMJ Open Sport & Exercise Medicine. 2020;6:e000886. doi:10.1136/bmjsem-2020-000886
  10. 10. Collins CL, Fletcher EN, Fields SK, et al. Neck strength: a protective factor reducing risk for concussion in high school sports. Journal of Primary Prevention. 2014;35(5):309-319. PMID:24930131
  11. 11. Knapik JJ, Hoedebecke BL, Mitchener TA, Lee RC. Effectiveness of Mouthguards for the Prevention of Orofacial Injuries and Concussions in Sports: Systematic Review and Meta-Analysis. Sports Medicine. 2019;49(8):1217-1232. doi:10.1007/s40279-019-01121-w
  12. 12. Tomei AL, et al. An Analysis of Guardian Cap Use and Changes in the Concussion Rate in National Football League Preseason Practices From 2018 to 2023. American Journal of Sports Medicine. (Counter-evidence: Watson NA, et al. Football helmet covers do not reduce concussions for high school players, UW-Madison N=2,610.) PMID:40746051
  13. 13. Centers for Disease Control and Prevention. HEADS UP — Data on Sports and Recreation Activities. Updated 2024. cdc.gov/heads-up
  14. 14. Patricios JS, Schneider KJ, Dvorak J, et al. Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport — Amsterdam, October 2022. British Journal of Sports Medicine. 2023;57(11):695-711. doi:10.1136/bjsports-2023-106898

Built around the research, with the counter-evidence cited.

NeuroGuard+ is a custom mandibular-stabilization appliance engineered around the mechanisms peer-reviewed concussion research keeps pointing back to — and we cite the studies that cut against the case alongside the ones that support it. That's how research-backed brain protection is supposed to read.

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