Mandibular Advancement Devices (MAD) are the most common type of FDA approved dental sleep device. They are also sometimes called oral appliances or simply dental devices. Mandibular advancement devices open the airway by moving the lower jaw forward. The sleep dental device improves and strengthens the rigidity of the airway by increasing muscle activity of the tongue and other muscles of the airway allowing air to flow from your mouth to your lungs. A dental sleep device looks similar to a sports mouth guard and can be comfortably worn in the mouth during sleep. Dental devices help prevent snoring and Obstructive Sleep Apnea (OSA). Most people find these devices much more comfortable than CPAP (the other primary treatment for OSA and snoring) and far less invasive.