Do devices made by a dentist really work for sleep apnea?

Dental devices are only effective for mild to moderate sleep apnea. It will usually improve your sleep apnea but may not completely control it. If you have moderate or severe OSA, CPAP is more likely to work to correct your sleep apnea than an oral appliance. However, an oral appliance may be a better option than no treatment at all if you cannot tolerate CPAP.