While CPAP (continuous positive airway pressure) machines and sleep apnea oral appliances are both treatment options for sleep apnea, they function differently. A CPAP machine delivers pressurized air through a mask, maintaining a constant flow of air to keep the airway open during sleep. On the other hand, a sleep apnea oral appliance is a device similar to a mouthguard and works by repositioning the jaw or tongue to help keep the airway open during sleep. Junée F. Gardy DDS, PA will work with you to help you decide if an oral appliance for sleep apnea is suitable for you.