Custom night guards generally protect against teeth grinding better than over-the-counter guards because they are molded to an individual mouth, though OTC guards cost less and are cleared by the FDA for at-home use.
Grinding your teeth at night sounds harmless until you notice flattened edges, morning jaw ache, or the noise your partner complains about. The choice between a lab-made guard and a drugstore one comes down to fit, durability, and cost — and the two are not built the same way.
OTC guards are FDA-cleared for laypeople to buy and mold at home (product code OBR, “Mouthguard, Over-the-Counter”) — a general-purpose device, not a fitted one. Custom guards, sold direct or through a dentist, are made from an impression or scan of your own teeth.
How Do Custom and Over-the-Counter Night Guards Differ?
A custom guard is built from a mold of your teeth, covering them fully and staying put, while an OTC guard is a one-size shell you soften in hot water and bite into yourself. That difference drives comfort, coverage, and longevity.
OTC guards offer little customization and use cheaper materials. Laboratory-made guards provide better comfort, coverage, and durability. The trade-off: you pay more and wait longer for custom; you save money and time with an OTC guard that may feel bulky or loosen over months. Some custom devices are also indicated as an aid in reducing medically diagnosed migraine pain tied to jaw clenching and bruxing, a use the FDA has cleared for specific models.
What Does the FDA Clearance Actually Cover?
Both types are cleared for the same core job: protecting teeth and restorations against grinding and clenching, and reducing damage and noise linked to bruxism. The difference is who is cleared to use them and how they are made.
OTC guards are intended for laypeople and sold without a prescription. Custom devices may be marketed as OTC or prescription depending on the specific clearance. Recent custom submissions include the Remi Custom Night Guard and the enCore Night Guard, both cleared in 2025. A “custom” label does not by itself mean a prescription is required.
Fit is where the paths separate. An OTC guard molded at the kitchen counter follows the general shape of your front teeth — SmartGuard’s clearance notes it softens in hot water and conforms to the anterior maxillary teeth, designed for home or office molding. A custom guard is built from an impression of your full arch, so it contacts more of the biting surface.
To see which fitted options have held up best in practice, this roundup of tested custom night guards compares the leading picks side by side.
How Do You Mold an Over-the-Counter Guard Correctly?
DenTek’s retail instructions for its Professional-Fit Dental Guard follow that order; getting the centering step wrong is the most common reason an OTC guard feels off.
- Center it over your upper teeth while looking in a mirror.
- Bite down firmly and hold for the time the package states.
- Let it set, then check that it seated evenly before bed.
You’ll know it worked when the guard stays put without pressure and your back teeth meet evenly. If one side sits high, reheat and reset it rather than wearing a guard that pushes your bite off.
When Should You See a Dentist Instead?
See a dentist if symptoms persist after you start wearing a guard, because a night guard does not treat the underlying cause of grinding. A guard manages wear on your teeth, not the clenching itself; ongoing pain, jaw tightness, or tooth damage needs evaluation for bruxism-related problems, bite issues, or another source.
Layering a night guard with another oral device can alter your bite, and orthodontic guidance warns against combining separate devices unless an orthodontist advises it. OTC guards are mainly cleared for nighttime use, and SmartGuard’s clearance caps wear at no longer than 12 consecutive hours in a 24-hour period. Price is the other honest gap — neither type has a single set retail figure, since custom cost depends on the provider and OTC pricing varies by brand and pack size.
Common Questions
Are over-the-counter guards a waste of money?
No. An OTC guard is better than grinding with no protection and is FDA-cleared for home molding without a prescription. It simply offers less customization and durability than a lab-made device, so it works best as a lower-cost starting point rather than a long-term solution.
How long does a store-bought guard last?
There is no single verified lifespan, because it depends on the brand, material, and how hard you grind. OTC guards use cheaper materials and see more wear, so expect to replace one sooner than a custom guard. Check yours for cracks or thinning and swap it when it stops seating evenly.
Can I wear a night guard if I have braces or a retainer?
Combining a night guard with another oral device can change your bite, and orthodontic guidance warns against wearing separate devices together unless an orthodontist advises it. Ask your orthodontist first, since a poorly paired fit can shift teeth or interfere with the other appliance’s job.
Sources
- U.S. Food and Drug Administration. “K251778 — Remi Custom Night Guard 510(k) Clearance.” Documents FDA clearance for a custom night guard in 2025.
- U.S. Food and Drug Administration. “K252004 — enCore Night Guard 510(k) Clearance.” Covers indication language for protecting teeth against grinding and bruxism.
- CareGuard Initiative. “Night Guards for Teeth Grinding.” Compares comfort, coverage, and durability of OTC versus laboratory-made guards.