Mouthguard Rules by Sport: Where NeuroGuard+ Fits
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NeuroGuard+ is a standalone lower-jaw mouthguard. It is worn by itself on the bottom teeth and is never worn together with an upper mouthguard. The NFHS has determined that NeuroGuard+ is permissible under the 2026 NFHS Football Rules1, clearing it for high school football nationwide. USA Hockey's rule covers "one jaw, customarily the upper," which accommodates a lower-arch appliance. World Rugby, USA Boxing classifications, wrestling, soccer, and basketball impose no upper-arch specification. In the remaining rule books that still name upper-teeth coverage, confirm with your officiating crew or equipment staff before competition — the answer is never to add a second mouthguard.
One guard, lower arch, worn alone — never with an upper mouthguard
NeuroGuard+ is a single custom appliance that seats on the lower arch, and it is designed to be the only mouthguard an athlete wears. Do not wear an upper mouthguard at the same time as NeuroGuard+. Stacking a second guard on the upper teeth interferes with the mandibular rest position the appliance is fabricated to hold, and that position is the entire mechanism the product is built around — it is not a comfort feature that can be compromised. A second guard also cancels the breathing and speech advantages that come from leaving the palate uncovered, which is the most common reason athletes actually keep a guard in their mouth for four quarters.
This is the single most important thing for a parent, coach, or athletic trainer to take away from this page. If someone tells you NeuroGuard+ is worn "in addition to" a regular mouthguard, that is incorrect. The fitting instructions state it directly: NeuroGuard+ goes on the bottom teeth, by itself. Fitting guidance is at the NeuroGuard+ fitting page, and any question about competition eligibility should go to your athletic trainer, athletic director, or officiating crew — not to a second mouthguard.
NFHS high school football: NeuroGuard+ is permissible under the 2026 rules
The National Federation of State High School Associations has determined that NeuroGuard+ is permissible for use in high school football. Following a review by both the NFHS Football Rules Committee and the NFHS Sports Medicine Advisory Committee (SMAC), Bob Colgate, NFHS Director of Sports and Sports Medicine, issued this interpretation1: "Upon further review by the NFHS Football Rules Committee and the NFHS Sports Medicine Advisory Committee (SMAC), we have determined the NeuroGuard+ mouthguard for Football does comply with the intent and purpose of NFHS Rule 1-5-1d(5) on page 24 of the 2026 NFHS Football Rules Book and thus would be permissive at this time."
NFHS writes the rule books used by 51 state associations and approximately 19,500 high schools3, so this determination reaches high school football programs across the country. Athletes wear NeuroGuard+ on its own — the determination is that the NeuroGuard+ appliance itself satisfies the rule, not that it is worn in combination with anything else. Coaches, athletic trainers, and parents evaluating NeuroGuard+ for a football program can treat it as a compliant option under NFHS football rules. Sport-specific buyer guidance for football is at The Best Mouthguard for Youth Football. If a local official is unfamiliar with the interpretation, the NFHS ruling is the document to bring to that conversation.
NFHS other sports: mouthguard mandates vary, and several have no arch specification
Beyond football, NFHS mandates mouthguards in ice hockey, boys' and girls' lacrosse, field hockey in most states, and wrestling when an athlete is wearing fixed orthodontic appliances3. NFHS does not mandate mouthguards in basketball, soccer, baseball and softball, volleyball, or other non-collision sports — a policy gap the medical literature has flagged repeatedly given the orofacial injury rates in basketball and soccer. In every sport where NFHS imposes no arch specification, and in every sport where no mouthguard is mandated at all, a NeuroGuard+ athlete has nothing to reconcile: the appliance is worn on its own with no rule conflict.
The NFHS football determination is the first sport-specific interpretation NeuroGuard+ has obtained, and it establishes the reviewing precedent — the Football Rules Committee and SMAC evaluated the appliance on its merits against the intent of the equipment rule. NeuroGuard+ is pursuing the same review process with other rules committees. Until a given sport has its own interpretation, athletes in NFHS sports other than football should confirm eligibility with their school's athletic trainer or state association. In no case is the resolution to wear a second mouthguard on the upper arch alongside NeuroGuard+.
NCAA football: visible color required, and no NeuroGuard+ determination yet
NCAA football requires every player on the field of play to wear a mouthguard covering the upper teeth, in a "visible color" — yellow, orange, or other distinguishable hues so officials can verify compliance from a distance2. Clear and white mouthguards are not permitted. The rule is enforced as an equipment violation and a referee may stop play to require correction. NCAA ice hockey, lacrosse, and field hockey carry parallel requirements with sport-specific color and material specifications. That specification traces to 1960s-era rule writing, when the dominant orofacial concern in collision football was fracture of the upper anterior teeth.
The NCAA has not yet issued a NeuroGuard+ interpretation of the kind the NFHS Football Rules Committee and SMAC issued for high school football. NeuroGuard+ is a lower-arch appliance and is worn alone; it is not paired with a second guard. Collegiate athletes who want to wear NeuroGuard+ should raise it with their institution's head athletic trainer or equipment manager, who is the person authorized to interpret NCAA equipment rules for that program, and the NFHS determination is a useful precedent to put in front of them. The underlying brand position is unchanged: upper-teeth coverage was codified to prevent dental injury, while the mechanism concussion research points to is mandibular stabilization — force dissipation through the temporomandibular joint and the jaw position that governs it.
NFL: no blanket rule — and the league is moving toward brain protection, not dental protection
The NFL does not mandate mouthguard use across all positions in its current rule book. The league's collective bargaining and player-safety apparatus has made mouthguard wear effectively universal at most contact positions, with team medical staffs typically issuing custom-fabricated appliances to every player on the roster as part of the equipment fitting process. Quarterbacks, kickers, and punters use mouthguards inconsistently; offensive and defensive linemen, linebackers, and skill-position contact players wear them as a matter of practice.
Because there is no codified arch specification, the NFL is a context in which a mandibular-stabilization appliance like NeuroGuard+ is worn with no rule friction at all. The league's evolving concussion-protocol enforcement — Guardian Cap mandates in 2024-26 preseason and now in regular-season play at certain positions — reflects an institutional shift toward multi-layer head protection that recognizes the limits of a helmet alone. The mandibular-appliance category is the next layer, and the professional game has fewer equipment-rule obstacles to adopting it than the amateur federations do.
USA Hockey: "one jaw, customarily the upper" — language that accommodates a lower-arch guard
USA Hockey, the national governing body for ice hockey in the United States, requires "an internal mouthpiece which covers all the remaining teeth of one jaw, customarily the upper" for all players in all USA Hockey-sanctioned games at the 12U, 14U, 16U, 18U, junior, women's, and disabled hockey levels4. The rule excludes goaltenders and adult recreational play but applies to virtually every competitive youth and junior context in the United States.
Read the language carefully: the rule says "one jaw, customarily the upper" — not "must be upper." It contemplates a mouthpiece covering the teeth of either jaw, which is precisely what a lower-arch appliance does. NeuroGuard+ covers all the lower teeth and is structurally compatible with the rule as written, though "customarily" leaves interpretation to the referee, league, and rink. Players and parents in USA Hockey-sanctioned competition should confirm with their league office or athletic trainer before relying on that reading. Hockey-specific buyer guidance — half-shield versus full-cage interaction, NHL data — is at The Best Mouthguard for Hockey. The NHL requires mouthguards only for players entering the league after a specified date; veterans may opt out, though most do not.
Why this matters beyond compliance: bodychecking-policy changes in USA Hockey, which raised the checking age to 14U starting in 2011-12, reduced concussion incidence by 58% in the underlying meta-analytic literature5. Equipment is the complement to those rule changes, and the protective effect is mechanism-specific — dental coverage does not change the impact-force pathway through the mandibular condyle, while mandibular stabilization is aimed directly at it.
Lacrosse: mouthguards required in men's play, expanding in women's, arch specification still in the rule books
USA Lacrosse requires mouthguards for all men's lacrosse competition under its rules, mirrored by the NCAA and NFHS at the college and high school levels, and those rule books specify upper-teeth coverage. Women's lacrosse rules historically did not mandate mouthguards in the same way, but recent rule changes have added requirements in many states and at the NCAA women's level. The sport's rapid growth — lacrosse has been the fastest-growing US team sport for over a decade — has driven a parallel increase in concussion-rate research and equipment-rule attention.
No lacrosse rules committee has yet issued a NeuroGuard+ interpretation. NeuroGuard+ is a lower-arch appliance worn on its own, and it is not paired with an upper guard under any circumstance. Lacrosse athletes and parents should confirm eligibility with their state association, league office, or officiating assignor before competition — and the NFHS football determination is the precedent worth citing in that conversation, since it is the first instance of a rules committee evaluating the appliance against the intent of an equipment rule and finding it permissible. Stick contact and ball impact create distinct injury mechanisms in lacrosse: high-velocity ball strikes to the face, stick checks to the head and shoulders, and player-to-player collisions during loose-ball pursuit. The protective evidence on mouthguards56 stratifies by mechanism — dental coverage prevents tooth fracture, while mandibular stabilization addresses the force pathway that produces concussion.
USA Boxing and combat sports: required at every level — and the rules align best with mandibular protection
USA Boxing, USA Wrestling, and the major MMA sanctioning bodies (UFC, ONE, Bellator, regional commissions) all require mouthguards for competitive bouts. USA Boxing's official rules describe a mouthpiece in terms that do not exclude a lower-arch form factor, and USA Wrestling requires a mouthpiece when an athlete is wearing fixed orthodontic appliances. International Olympic combat sports — boxing, judo, taekwondo, freestyle and Greco-Roman wrestling — carry parallel requirements without an arch mandate that a lower appliance conflicts with.
Combat sports are where the brain-protection conversation aligns most cleanly with the rule landscape. The impact mechanism, direct strikes to the head and jaw, maps onto the mandibular-condyle force pathway the protective research describes. NeuroGuard+ is worn on its own in this rule context, and the mechanism it addresses is the one combat-sports concussion research has been investigating for decades. Athletes should still verify the specific classification rules with their corner or commission, but the equipment-rule friction that exists in some amateur federations is largely absent here.
World Rugby: required for all participants — and the rule doesn't specify upper or lower
World Rugby, the international governing body for rugby union, requires every player at every level — international test, professional club, age-grade, and amateur — to wear a mouthguard during play. The rule is enforced consistently across the unions of all member nations including USA Rugby. Critically, the World Rugby mouthguard rule does not specify upper or lower coverage: any custom-fitted appliance covering teeth satisfies the requirement, which means NeuroGuard+ is worn as the athlete's only mouthguard with no rule conflict.
World Rugby has also been a leader in instrumented-mouthguard research: smart mouthguards measuring head impact magnitude and direction have been deployed across the elite men's and women's game and in age-grade research, generating the most granular head-impact dataset in any sport. The data those mouthguards have produced reinforces what the laboratory and clinical research already showed — the impact-force pathway runs through the mandible, and the mechanism that matters for brain protection is jaw stabilization, not dental coverage. NeuroGuard+ as an unmodified custom appliance satisfies World Rugby's mouthguard requirement; instrumented variants are governed by separate research-use protocols.
Youth soccer (US Soccer, AYSO, NFHS Soccer): not required — and that's the opportunity
US Soccer Federation rules and the NFHS soccer rule book do not currently require mouthguards in soccer competition at any level, despite well-documented concussion risk from heading and player-to-player collisions. AYSO similarly does not mandate them. The position has come under scrutiny as concussion research has expanded into soccer-specific contexts: a series of CDC and NIH-funded studies have documented elevated concussion rates in girls' high school and youth soccer.
Because soccer rules impose no arch specification — or any mouthguard requirement at all — athletes and parents who add NeuroGuard+ face no compliance friction whatsoever. The brain-protection mechanism that matters in soccer, jaw stabilization and force dissipation during heading and collision, is the mechanism NeuroGuard+ is built around, and there is no rule body to navigate. Some state high school associations have moved toward "strongly recommended" or insurance-incentivized mouthguard use in soccer, but a categorical national rule change has not occurred. The take-home: families who care about brain protection can act without waiting for a governing body to catch up.
The rules were written to protect teeth. The research is now about the brain.
Most governing-body mouthguard rules were written in the 1960s to address what was then the dominant orofacial concern in collision sports: fracture of the upper anterior teeth. That is why several sport rule books name an upper-teeth-covering appliance. The orofacial-injury rationale is well-supported in the meta-analytic literature6 — mouthguards do reduce dental injury, and the rules deliver on that objective.
The brain-protection mechanism is a different conversation. The 2023 BJSM meta-analysis5 — a 26% reduction in collision-sport concussion incidence — is anchored in research on jaw stabilization, force dissipation, and airway dynamics, and the appliances that produce those effects are mandibular (lower-jaw) devices: the Hutchison 2018 MPRP appliance, the Singh 2009 customized mandibular orthotic. The mechanical pathway is straightforward: force enters the body through the mandibular condyle and transmits into the skull base, and jaw position determines whether that pathway is braced or open.
NeuroGuard+ is in that second category, and it is designed to do that job alone. The appliance holds the mandible in a stabilized rest position, which is why it is worn by itself on the lower arch and why adding an upper guard on top of it is not a supported way to use the product. The NFHS football determination1 is the first case of a rules committee reviewing the appliance against the intent of an equipment rule and concluding it complies — evidence that the rule landscape is beginning to accommodate the brain-protection category rather than only the dental one.
For sports whose rules committees have not yet reviewed NeuroGuard+, the practical step is a conversation with the athletic trainer, athletic director, or officiating crew — the people empowered to interpret equipment rules locally. The fit-quality gap between custom and retail products, and why it determines whether any protective effect transfers from research to reality, is at Custom vs Boil-and-Bite Mouthguards.
Frequently asked questions
Should my athlete wear NeuroGuard+ with an upper mouthguard?
No. NeuroGuard+ is a standalone appliance and is designed to be worn by itself on the lower arch. Do not wear an upper mouthguard at the same time as NeuroGuard+. Adding an upper guard on top of NG+ interferes with the jaw position the appliance is built to hold, which is the entire mechanism the product is engineered around, and it degrades the breathing and speech advantages of a lower-arch design. One appliance, lower arch, worn alone.
Is NeuroGuard+ legal for high school football?
Yes. Following a review by the NFHS Football Rules Committee and the NFHS Sports Medicine Advisory Committee (SMAC), the National Federation of State High School Associations determined that the NeuroGuard+ football mouthguard complies with the intent and purpose of NFHS Rule 1-5-1d(5) in the 2026 NFHS Football Rules Book and is permissible for play1. NFHS rules are used by 51 state associations and roughly 19,500 high schools, so the determination covers high school football programs nationwide. Athletes wear NeuroGuard+ on its own; no upper mouthguard is worn with it.
Is the same mouthguard legal in NFHS, NCAA, and USA Hockey?
NeuroGuard+ is one appliance worn across sports and seasons, and its status varies by governing body. NFHS football has affirmatively determined NeuroGuard+ is permissible under the 2026 rules. USA Hockey's rule requires a mouthpiece covering the teeth of "one jaw, customarily the upper," which by its own language accommodates a lower-arch appliance. World Rugby, USA Boxing classifications, USA Wrestling, soccer, and basketball impose no upper-arch specification. NCAA football and lacrosse rule books still specify upper-teeth coverage and have not yet issued a NeuroGuard+ determination; athletes in those contexts should confirm with their institution's equipment staff or officiating crew before competition.
Do clear mouthguards meet NCAA football rules?
No — NCAA football specifically requires a "visible color" so officials can verify compliance from a distance. Clear, white, or transparent mouthguards are not permitted in NCAA football competition. Yellow, orange, blue, green, red, or other readily distinguishable colors satisfy the rule. Custom appliances can be fabricated in any compliant color; the requirement is visibility, not a specific shade.
Are mouthguards required in NFL games?
The NFL does not categorically mandate mouthguards in its rule book, but team medical staffs and the NFLPA's player-safety guidance have made mouthguard use effectively universal at most contact positions. Quarterbacks, kickers, and punters use mouthguards inconsistently. The 2024-26 expansion of Guardian Cap requirements (preseason practices; certain positions in regular-season games) reflects an evolving league posture toward multi-layer head protection, of which mouthguards are one component.
Why don't soccer rules require mouthguards?
US Soccer, AYSO, and NFHS soccer rules have not mandated mouthguards historically, despite documented concussion risk. The justification offered has been that soccer's contact frequency and impact mechanism differ from helmet-required sports. The position is increasingly debated as concussion research in soccer has accumulated, particularly in girls' soccer where concussion rates are highest among any soccer category. No national rule change has been adopted as of 2026, but state-level "strongly recommended" language is appearing in some high school associations.
References
- 1. NFHS Football Rules Committee and NFHS Sports Medicine Advisory Committee. Football rules interpretation: NeuroGuard+ mouthguard complies with the intent and purpose of Rule 1-5-1d(5), 2026 NFHS Football Rules Book, p. 24. Interpretation issued by Bob Colgate, NFHS Director of Sports and Sports Medicine. nfhs.org
- 2. NCAA Playing Rules Oversight Panel. Sport Rule Books (Football, Ice Hockey, Lacrosse, Field Hockey). Annual editions. ncaapublications.com
- 3. National Federation of State High School Associations. Sport Rule Books (Football, Ice Hockey, Lacrosse, Field Hockey, Wrestling). Annual editions. nfhs.org
- 4. USA Hockey. 2025-2027 Official Playing Rules. usahockey.com
- 5. 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
- 6. 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
