While the way a CPAP works to help you keep breathing seems fairly obvious – using air pressure to hold your airway open – an oral appliance may seem a little bit more mysterious. How can a tiny oral appliance keep your airway from closing – especially when you are fast asleepIt’s actually pretty simple:Both snoring and obstructive sleep apnea are caused by a collapse of the soft tissues or the tongue into the airway, blocking it and keeping you from taking a proper breath. But more and more research is showing that oral appliances like the ProSomnus Sleep and Snore Devices work amazingly well by gently advancing your lower jaw and keeping it in a slightly forward position.