Mouthguard Buyer's Checklist: How to Evaluate a Mouthguard Without Getting Sold
Last updated
If you're shopping for a mouthguard for a kid in a contact sport, three things should drive the decision: posterior thickness ≥3 mm, custom fit from dental impressions, and retention strong enough to stay in across a full game. Those three together are what the 2014 Winters & DeMont RCT showed reduces concussion rates 2.3× lower than over-the-counter alternatives1. The eight checklist items below are how to evaluate any specific mouthguard against that bar.
How to evaluate a mouthguard in 30 seconds
Most parents go to a sporting goods store, grab a $20 mouthguard off a peg, and assume the league mandate is satisfied. That gets you dental protection — and the 2019 Knapik systematic review of 26 studies confirms that's a real protective category for orofacial injuries4. But it doesn't get you brain protection. The peer-reviewed research that documents reduced concussion incidence — the 2023 BJSM meta-analysis showing a 26% reduction across 192 studies in collision sports2, the 2014 Winters & DeMont RCT showing 3.6% vs 8.3% concussion rates between custom and boil-and-bite1 — uses devices that meet specific criteria the off-the-peg products don't.
The eight criteria below are how to tell the difference. They're ordered from "most directly tied to the protective research" to "secondary considerations." If a mouthguard you're evaluating fails on items 1-3, it doesn't matter what it scores on items 4-8. If it passes 1-3 cleanly, the rest become tiebreakers between similar-tier products.
The 8-item checklist
Custom fit from dental impressions (not boil-and-bite molding)
This is the single most important criterion. The 2014 Winters & DeMont RCT compared 220 athletes in custom pressure-laminated mouthguards (built from dental impressions) against 192 in over-the-counter mouthguards (boil-and-bite or stock)1. The custom group had a 3.6% concussion rate; the OTC group had 8.3%. A boil-and-bite mouthguard is molded by the athlete at home using boiling water — the fit it produces is approximate, doesn't position the lower jaw the way custom devices do, and degrades over the course of a season as the athlete chews on it. Custom devices are manufactured to specifications. Always ask: how was this device fit to my athlete's actual teeth?
Posterior occlusal thickness ≥3 mm
The 1964 cephalometric X-ray studies that started this whole conversation showed that mouthguards needed at least 3-4 mm of material at the back teeth to meaningfully change force transmission to the skull. The 2014 RCT validated this empirically: custom mouthguards averaging 3.50 mm posterior thickness in the protective arm, vs 1.65 mm at season start (1.34 mm at injury) in the control arm1. Below ~3 mm, the mechanical pathway force takes from the jaw to the skull base isn't blocked. Always ask: what's the posterior thickness specification, and is it manufactured to that spec consistently?
Retention strong enough to stay in under contact and breathing
If the mouthguard isn't in the mouth at the moment of impact, the protective research stops applying. The 2014 RCT documented this directly: 50% of the OTC mouthguards in the control arm were stock guards with little real fit, 40% were boil-and-bite, and 10% had been cut off entirely. Three of the OTC concussions in the study happened to players wearing nothing or a stub of plastic at impact1. Compliance under contact, breathing, and talking matters as much as the static fit at the start of the season. Always ask: does the device stay in when my athlete is talking to a coach, breathing hard, or being hit?
Doesn't measurably impair aerobic performance
The 2017 Caneppele meta-analysis of 14 studies on cardiopulmonary capacity found that stock and boil-and-bite mouthguards measurably reduce VO2max and minute ventilation during exercise (p=0.0001), while custom-made mouthguards do not3. So a cheap mouthguard isn't just less protective — it actively measurably hurts your athlete's aerobic output during a game. The defensible bar for any mouthguard is "no significant impairment of VO2max or VEmax." Always ask: has the manufacturer published or referenced cardiopulmonary data on this device?
Engineered around lower jaw position, not just dental coverage
The most protective mouthguards in the recent literature aren't just "thick mouthguards" — they're devices specifically engineered to hold the lower jaw in a controlled position. The 2018 Hutchison cohort of 4,010 athletes wearing a Mandibular Physiologic Rest Position (MPRP) device reported a 0.224% concussion rate over 2003-20185. The mechanism is that a stable jaw position prevents the condyle from rolling into the skull joint at impact. Always ask: is the lower jaw positioning a design intent, or just a side effect of the molding?
Holds dimensions through a season of wear
A mouthguard that's 3.5 mm at season start but 1.5 mm by midseason isn't a 3.5 mm mouthguard — it's a mouthguard whose protective specifications have degraded. The 2014 RCT measured boil-and-bite mouthguards thinning from an average 1.65 mm at season start to 1.34 mm at injury time1. Pressure-laminated custom devices are manufactured to hold their dimensions through a season; off-the-peg products are not. Always ask: does this device hold its specifications through wear, or does it degrade with use?
FTC-compliant marketing language
The 2018 FTC enforcement action targeted mouthguard manufacturers using "concussion prevention" language without supporting evidence. If a brand's marketing copy says their product "prevents concussions," they are making a claim the FTC has been actively pursuing — and the brand is exposing both itself and its customers to that pursuit. The defensible language is "associated with reduced concussion incidence" and "designed to help reduce risk." Always ask: what specific words is this brand using? Are they describing reduction or claiming prevention?
Team-ordering workflow available (for programs and schools)
For coaches and athletic directors, the per-athlete economics of custom mouthguards depend heavily on whether the manufacturer supports a team workflow — bulk impression kits, batch fitting, integrated logistics for shipping a roster's worth of finished devices. Without team ordering, custom mouthguards are a per-family decision that compounds inequitably across a roster. With team ordering, custom can be the default for an entire program at a comparable per-athlete cost to retail. Always ask: does this manufacturer have a team-program workflow, and what's the per-athlete price at typical roster sizes?
Scorecard
How NG+ stacks up against the most-searched alternatives on the eight criteria above. ✓ = meets the criterion; ✗ = does not; ~ = partial / depends.
| Criterion | NeuroGuard+ | Boil-and-bite | Stock guards |
|---|---|---|---|
| 1. Custom fit from dental impressions | ✓ | ✗ | ✗ |
| 2. Posterior thickness ≥3 mm | ✓ | ✗ (1.65 mm avg) | ✗ |
| 3. Retention under contact + breathing | ✓ | ~ (variable, often removed) | ✗ |
| 4. No aerobic performance impairment | ✓ (Caneppele 2017) | ✗ (significantly impaired) | ✗ |
| 5. Engineered jaw positioning | ✓ (MPRP design) | ✗ | ✗ |
| 6. Holds dimensions through a season | ✓ (pressure-laminated) | ✗ (chews thin) | ✗ |
| 7. FTC-compliant marketing | ✓ | ~ (varies by brand) | ~ (varies by brand) |
| 8. Team-ordering workflow | ✓ | ~ (limited) | ✗ |
5 red flags
If a mouthguard brand does any of the following, walk away. These aren't subtle issues — they're signs the brand is either marketing past the evidence or selling the wrong product category for collision-sport protection.
- Uses "prevents concussions" or "concussion prevention" anywhere. The FTC has been actively suing for this language. If a brand is comfortable making that claim, they're either ignorant of the enforcement environment or willing to gamble — neither is what you want from a brain-protection appliance.
- Cites studies without disclosing inventor or financial relationships. The Hutchison 2018 study has an inventor disclosure on the device. We disclose it every time we cite the study. If a brand cites research without surfacing relevant conflicts of interest, the credibility of every claim should drop.
- Doesn't list posterior thickness anywhere on the product page. The 3 mm threshold is the most critical specification for the protective effect. If a brand isn't talking about posterior thickness, they're either not manufacturing to that spec or hoping you won't ask.
- Markets boil-and-bite as "custom-fit." Boil-and-bite is not custom fit. The molding produces an approximate fit shaped by the athlete's bite-down at home, but it's not built from impressions of the actual dentition and it doesn't position the lower jaw the way the protective research describes.
- Has no compliance or retention story. "Stays in your mouth" isn't a marketing claim; it's a baseline functional requirement. If a brand can't explain why their device stays in under contact and breathing better than the alternatives, they probably haven't engineered for retention.
For coaches and athletic directors evaluating team programs
The per-athlete economics of custom mouthguards look different at team scale than at individual scale. A few things to factor in:
- Bulk impression kits reduce per-athlete fitting cost. Manufacturers with team-program workflows ship kits the program completes, returns, and gets finished devices back from — no individual dental visits required.
- Roster-wide compliance is meaningfully better with custom devices. The 2014 RCT documented 50% of OTC mouthguards as stock guards with no real fit and 10% as cut-off entirely1. At team scale, that translates to a noticeable fraction of any given roster being effectively unprotected at any given moment.
- The cost-per-concussion-avoided math works out favorably for custom programs in collision sports. The 2.3× concussion-rate difference between custom and OTC, applied across a roster of 50 athletes over a season, is multiple concussions avoided per program per year — and concussion management costs (medical, missed school, return-to-play protocols) are substantial.
- Liability and program reputation matter for athletic directors. Equipping a roster with a research-backed brain-protection appliance is a different stance than equipping them with $20 boil-and-bite guards bought at a sporting goods store, both legally and reputationally.
NG+ has a full team-ordering workflow at NG+ team ordering, with bulk impression kits, integrated fitting logistics, and per-athlete pricing scaled for program-level purchases.
What we won't claim
This page is a buying guide for parents and coaches evaluating mouthguards in good faith. It is not a guarantee that any specific product will prevent a concussion in any specific collision. We will not use the word "prevent" on this site, and any brand that does is making a stronger claim than the evidence supports.
What the data actually supports:
- Mouthguards in collision sports are associated with a 26% reduction in concussion incidence per the 2023 BJSM meta-analysis2
- Custom-fit pressure-laminated mouthguards are associated with concussion rates 2.3× lower than over-the-counter alternatives in the 2014 RCT1
- The protective effect is fit-quality dependent and most robust for devices manufactured to a thickness specification with consistent retention
- Equipment is one layer of concussion protection — helmet quality, neck strengthening, rule compliance, and concussion management protocols matter just as much
If a brand promises more than that, they're outside the evidence. The checklist above is how to tell.
Bottom line
The eight criteria above are how to evaluate any mouthguard against the protective research. Items 1-3 (custom fit, ≥3 mm posterior thickness, retention) are the threshold the protective effect documented in the meta-analytic literature is associated with — if a device doesn't pass those three, the rest of the criteria don't really matter for collision-sport protection. Items 4-8 are how to differentiate between custom devices that all pass the threshold.
NeuroGuard+ is engineered to pass all eight. We tell you what we won't claim ("prevents concussions") just as clearly as what we will ("associated with reduced incidence," "research-backed brain-protection appliance"). For the deeper research story, see How Mouthguards Reduce Concussion Risk. For the honest answer to the bigger question, see Do Mouthguards Prevent Concussions?. For the comparison story, see Custom vs Boil-and-Bite Mouthguards.
FAQs
What's the single most important thing to look for in a mouthguard?
Posterior thickness and how the mouthguard is manufactured. The 2014 Winters & DeMont RCT1 found custom mouthguards averaging 3.5 mm posterior thickness produced a 3.6% concussion rate vs 8.3% for boil-and-bite mouthguards averaging 1.34 mm at injury time. The thickness threshold associated with the protective effect in the underlying research is ≥3 mm posterior. Custom-manufactured mouthguards built from dental impressions hold that thickness through a season; boil-and-bite mouthguards molded by athletes at home and chewed on through practices do not.
How can I tell if a brand is making FTC-compliant claims?
Look for the words "prevent" and "concussion prevention." If those words appear in the marketing copy or on the packaging, the brand is making a claim the FTC has been actively suing mouthguard manufacturers for. The defensible language is "associated with reduced concussion incidence" or "research-backed brain-protection appliance" or "designed to reduce risk" — never "prevents." Also look for whether the brand discloses inventor relationships on cited research, includes counter-evidence in their educational content, and provides full citations to primary peer-reviewed sources rather than vague "studies show" framing.
What about Q-Collars, Guardian Caps, and other concussion equipment?
Different equipment categories have different effect sizes in the same 2023 BJSM meta-analysis2. Mouthguards in collision sports: 26% concussion reduction. Bodychecking policy changes in hockey: 58%. Contact limitations in football practice: 64%. Guardian Caps: 54-62% reduction in NFL preseason data, but a separate Wisconsin high school study of 2,610 players found no significant effect — population and sample size matter. Concussion protection is multi-layer; equipment is one layer. The mouthguard is the layer most athletes already wear, so getting it right is high-leverage. But it should be combined with helmet quality, neck strengthening, rule compliance, and concussion management protocols — not used as a substitute for any of them.
How much should a custom mouthguard cost?
Pricing varies by manufacturer and fitting workflow. Individual custom mouthguards typically run several times the price of a boil-and-bite from a sporting goods store, but the per-athlete cost narrows substantially for team programs once fitting is amortized across a roster. The right question isn't "what's the lowest price" — it's "what's the cost per concussion avoided over a season," which is what the 2014 RCT data lets you estimate. For team programs in collision sports, the math typically favors custom even before factoring in compliance and performance differences.
Should I buy a mouthguard online or get one fitted by a dentist?
Both can deliver custom fit if the manufacturer uses real dental impressions. The key distinction isn't online-vs-in-person — it's whether the device is built from impressions of your kid's actual teeth (custom), or molded by your kid at home using boiling water and biting down on a generic blank (boil-and-bite). Some custom mouthguard providers (including NeuroGuard+ team-ordering) ship impression kits that you complete at home, then return for manufacturing. Some require an in-person dental visit. Either workflow is custom; the home-impression workflow is what makes team-program pricing feasible.
References
- 1. Winters JE Sr, DeMont R. Role of mouthguards in reducing mild traumatic brain injury/concussion incidence in high school football athletes. General Dentistry. 2014 May/Jun;62(3):34-38. Academy of General Dentistry
- 2. 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
- 3. Caneppele TMF, Borges AB, Pereira DM, et al. Mouthguard Use and Cardiopulmonary Capacity – A Systematic Review and Meta-Analysis. Sports Medicine International Open. 2017;1(5):E172-E182. doi:10.1055/s-0043-117599
- 4. 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
- 5. Hutchison DD, Madura C, Hutchison MC. Impact of an improved mandibular rest position via custom mouth guard on the incidence of concussions in athletes. (Manuscript; Michigan State University College of Human Medicine.) 2018. Disclosure: corresponding author invented the studied device.