The oral appliance is suitable for patients with mild obstruction and a slightly small lower jaw. It is a silicone brace that is worn over the teeth to pull the lower jaw forward, and airway obstruction due to the lower jaw structure can be improved. However, in patients with very severe obstruction, the brace can improve only to a limited extent. There is also a subset of patients with whistling apnea that have both pharyngeal cavity soft tissue problems and mandibular structure problems as the etiology, and if only pharyngeal cavity surgery is performed, it is recommended that orthoses be worn postoperatively. These oral orthoses need to be worn on the teeth every night while sleeping and must be adhered to for a long time. The overall effectiveness can be about 80%. However, the oral appliance has a very limited range of pulling the jaw bone, it is not that strong, and too strong for the temporomandibular joint to withstand. If jaw recession is a serious problem, it can only be changed surgically. When the orthodontic appliance is first put on, some people adapt very well, some people will be very uncomfortable, the next day the teeth are too sore, feel unable to open the mouth, can not chew things, bite some disorder. Therefore, such people should gradually adapt to the device and stop wearing it for a day or two after two or three days to recover and wear it again. The orthodontist needs to make an orthodontic appliance according to the patient’s tooth shape and bite, the approximate cost is more than 2600 yuan, some hospitals may need about 3000. There are cheaper ones for sale online, but the silicone material may be different and there is no doctor to make a tooth-shaped bite for you.