0.8 repairs/relines per year. Some patients can find these devices somewhat uncomfortable, although many patients find them less bothersome than CPAP mask treatment, so patients are more likely to wear them consistently and comply with treatment CPAP manufacturers claim that improperly fitted devices may cause teeth to shift over time, like with CPAP, but cite no evidence to support these claims Patients may pay around $1900 out of pocket to secure these devices, and, in the US, some health plans do not cover these costs. The high price for prescription devices has led to a proliferation of lower cost non-prescription devices that are unproven and some sleep specialists suggest may be dangerous. Adherence to oral appliance is strongly associated with patient reservations regarding the effects of the device on teeth, possible lack of efficacy, and discomfort. See also Dental braces Oral and maxillofacial surgery Orthognathic surgery Prosthodontics Trismus References External links Dental equipment Treatment of sleep disorders