What Do Mouthguards Do for Sports? | Tooth & Jaw Protection

An athlete takes an elbow to the jaw during a boxing match or a stray ball to the face during a pickup soccer game. Without a mouthguard, that force travels straight through the lower jaw into the upper teeth and skull. The device itself is simple — a resilient, removable tray that sits over your upper teeth — but the protection it provides is layered: shock absorption, soft-tissue separation, and jaw stabilization. What a mouthguard cannot do is prevent a concussion from a direct head strike; that job belongs to a helmet. But for everything below the crown of the head, it is the single most effective piece of dental safety equipment you can wear.

The Three Jobs a Mouthguard Does

The American Dental Association recommends mouthguards for more than 30 sports — from football and rugby to skateboarding and weightlifting — and the protection breaks down into three distinct functions.

Force Dissipation. When the lower jaw absorbs a hit, a mouthguard creates a cushion between the upper and lower teeth so the mandible cannot jam directly into the maxilla.

Soft-Tissue Separation. Lips and cheeks press against teeth during a collision. A mouthguard pushes those tissues away, preventing the sharp edges of teeth from cutting the inside of the mouth — a risk that is especially high for athletes wearing braces or other orthodontic appliances.

Jaw Stabilization. By holding the lower jaw in a slightly forward position, a mouthguard reduces the energy transmitted through the temporomandibular joint toward the base of the skull. This is the mechanism that may lower the severity of certain concussions, though broad medical reviews describe concussion reduction as inconsistent — mouthguards should never be relied on as primary concussion protection.

Which Type of Mouthguard Actually Works

Fit determines everything. A loose guard that shifts during contact offers zero protection and can interfere with breathing or speech. The three available types form a clear hierarchy.

Stock guards are marketed for their low price, but the ADA notes that a mouthguard must have “adequate retention” to be effective — and a pre-formed tray that cannot hold its position offers minimal protection. Boil-and-bite guards are a fair middle ground for recreational play. Custom-fabricated guards, made from a dentist’s precise mold, are the only option recommended by the Cleveland Clinic and the ADA for high-impact sports such as MMA, rugby, boxing, and football. Our tested roundup of the best custom mouthguards for MMA breaks down which models hold up under repeated strikes and which labs deliver consistent quality for the price.

Dental insurance often covers custom mouthguards under preventive or orthodontic benefits, so checking your plan before paying out of pocket is worth the phone call.

Common Mistakes That Undo the Protection

The most frequent error is trusting a stock guard in a high-impact sport. A poorly fitted tray dislodges on the first hit, leaving the teeth and jaw unprotected for the rest of the match. The second mistake is assuming a mouthguard alone prevents concussions — it can buffer the jaw-to-jaw impact that may contribute to head trauma, but a direct hit to the crown of the head bypasses the mouthguard entirely. The third is skipping the guard during practice. The ADA recommends wearing a mouthguard during all practices and competitions, because injuries happen just as often in drills as in games.

How to Get a Custom Mouthguard That Fits

Getting a custom guard takes five straightforward steps starting with a dentist visit. You return to verify fit, retention, and comfort — adjustments are made on the spot if the guard feels bulky or interferes with breathing.

Daily maintenance matters: clean the guard with mild soap or toothpaste and store it in a ventilated case to prevent bacterial growth. A well-maintained custom guard can last a full season or longer and outperforms any off-the-shelf option the moment contact happens.