Oral appliances (OA) that treat snoring, UARS, and OSA are devices worn in the mouth similar to sports mouth guards or orthodontic retainers. They are made of plastic and fit partially or completely within the mouth. Currently there are over 40 different types of oral appliances available. OA’s may be used alone or in combination with other means of treating sleep apnea, such as weight management, surgery and CPAP. There is no one particular appliance that will work for every patient.