A mouthguard is only as protective as its fit. Here is how the three main types compare for sports, grinding, and TMJ - and which makes sense for which use.
Stock guards - fast and cheap, but limited
Stock mouthguards are pre-formed, ready-to-wear pieces of plastic in S/M/L sizing. They are the cheapest option ($5-$25) and require no fitting. Trade-offs:
- Bulky - most adults find them uncomfortable enough to remove.
- Don't hold in place - must be clenched to stay positioned.
- Limited shock absorption - provides some protection but well below custom-fit standard.
- One-size fit - cannot accommodate orthodontic appliances or unique bite patterns.
Reasonable for once-a-year casual use or as a short-term stand-in. Not appropriate for contact sports, orthodontic patients, or TMJ.
Boil-and-bite - the workable middle option
Boil-and-bite guards ($15-$40) are made of thermoplastic - you boil them, bite into them, and they form a rough impression of your teeth. Trade-offs:
- Better fit than stock, but still considerably less precise than custom.
- Material thins in heavily-bitten areas - can lose protection over months.
- Hard to fit accurately without help - multiple attempts often needed.
- Less durable - typically need replacing every 3-6 months with daily use.
Reasonable for youth recreational sports where getting a custom guard remade with growing teeth is uneconomical, or as a stopgap. Not ideal for high-impact sports, post-orthodontic patients, or TMJ.
Sport-specific recommendations
- Football, hockey, lacrosse, rugby, MMA, boxing: Custom guard is non-negotiable. Many leagues mandate them.
- Basketball, soccer, baseball, softball: Custom or quality boil-and-bite. Dental injuries are common in these "non-contact" sports.
- Wrestling, judo, BJJ, jiu-jitsu: Custom recommended. Grappling sports have surprisingly high tooth-fracture rates.
- Skateboarding, mountain biking, BMX, skiing/snowboarding: Custom recommended for serious participants - falls onto chin or face are common.
- Recreational/youth sports: Custom ideal but quality boil-and-bite acceptable for kids whose teeth are still erupting.
- Cheerleading and gymnastics: Often overlooked - custom guards reduce dental injuries from falls.
Custom guards for grinding and TMJ
For bruxism (grinding) and TMJ, the recommendation is always a custom guard:
- Designed for nighttime wear - slim profile, comfortable to sleep in.
- Material formulated for grinding - harder than sport guards, designed to last under chewing forces.
- Bite balanced by the dentist - random contacts in OTC guards can worsen TMJ symptoms.
- Adjusted at follow-up - small contact tweaks make a big comfort difference.
This is one of the clearest cases where the upfront cost difference is rapidly recouped - a custom guard prevents the kind of fracture that can turn into a $2,500+ crown plus possible root canal.
Frequently asked questions
- How long does a custom mouthguard last?
- Sports mouthguards typically last 1-3 seasons of regular use; nighttime guards 3-7 years. We check fit at every recall visit.
- Can I wear a sport mouthguard at night for grinding?
- It is not ideal - sport guards are bulkier, harder to sleep in, and made for impact rather than constant clenching. A dedicated nighttime guard is the right tool for grinding.
- Will my insurance cover a mouthguard?
- Sport mouthguards are usually not covered. Therapeutic TMJ splints are often covered under medical insurance with a documented diagnosis. Dental insurance coverage for night guards varies plan to plan.
- How do I clean my mouthguard?
- Rinse with cool water after each use, brush gently with a soft toothbrush (no toothpaste - too abrasive), and store in a vented case to dry. Once a week, soak in denture cleaner or a 50/50 vinegar/water solution to disinfect.