How long does a night guard last, and when should it be replaced?
Guards fatigue with nightly use; bite-through spots, cracks, or a loose fit are the signals.
For people who grind, a night guard is the main shield between their veneers and years of clenching force. The appliance itself is a consumable: acrylic and thermoplastic materials slowly deform and thin under nightly load.
Reading the wear on your guard
Replace-worthy findings include a spot worn through to a hole, visible cracks, a fit that has gone loose or rocking, and deep bite imprints that flatten the surface. Bringing the guard to each dental checkup lets the wear pattern be read alongside the veneers it protects.
Lifespan varies widely with grinding intensity and material, from many months to several years, so no single figure fits everyone. Ask the dentist to judge your guard at each visit rather than waiting for it to fail at night.
MediIndex articles are for general information only and are not medical advice, diagnosis, or advertising. Outcomes vary by individual — consult a board-certified specialist for personal decisions.