FAQ
How long do night guards last?
A straight answer first, then the context behind it, from the technicians who do the work.
THE SHORT ANSWER
A professionally fabricated hard acrylic night guard typically lasts 3 to 5 years with consistent nightly use and proper care. Soft thermoplastic guards wear faster, often 6 to 18 months. Actual lifespan depends on bruxism severity, occlusal design, and how well the patient maintains the appliance. Annual occlusal checks help catch wear before the guard fails chairside.
THE CONTEXT
What sits behind it
For dentists managing bruxism patients, the material choice at fabrication sets the lifespan ceiling from day one. Hard acrylic (processed heat-cured PMMA) handles heavy parafunction without deforming, which is why lab-fabricated guards consistently outlast over-the-counter soft options by 2 to 4 years. Dual-laminate designs, hard outer shell with a soft inner lining, offer a middle path for patients who find full-hard guards uncomfortable, though they wear at an intermediate rate closer to 2 to 3 years under moderate bruxism load.
Severity is the biggest variable. A patient grinding at 80+ pounds of occlusal force can chew through a hard acrylic guard in under 2 years. That is clinical data worth collecting at the annual adjustment visit. Documenting wear facets on the guard at each recall lets you build the case for an earlier replacement cycle and prevents the patient from defaulting to a pharmacy tray that offers no real protection.
From the lab side, fit precision at delivery directly affects how long a guard stays in service. A guard that seats with micro-rock puts differential pressure on the acrylic, accelerating fracture at the midline or near thin posterior flanges. Accurate impressions or digital scans, combined with articulated mounting, let the lab dial in even occlusal contact from the start, which distributes force and extends wear life measurably.
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