A sleep appliance may eventually need replacement because of wear, damage, repeated repairs, changes in the teeth, or a treatment need that the existing design no longer meets. There is no single replacement date that fits every device. A review of the appliance and the mouth helps determine whether repair, adjustment, or a new device is the more appropriate choice.
The medical plan also matters. An appliance made several years ago may have been based on a different dental condition, symptom pattern, or treatment setting. Replacement should reconnect those details with current care rather than copying the old device without review. If a new appliance is selected, updated records, fitting, guided adjustment, and follow-up remain important. The aim is a device that suits your present oral condition and can be evaluated within the ongoing sleep-treatment plan.