The price of the mouth breathing appliance is usually about 5,000 yuan, and the specific price varies according to the material of the material applied by the patient, the manufacturer, and the local tariff. The mouth breathing orthosis is mainly used for the correction of adenoid face treatment, which is a very common disease in the ENT department, because adenoid hypertrophy of the patient’s long-term open mouth breathing, the nose is not ventilated resulting in the patient’s maxillary development deformity, teeth protrusion, seriously affecting the patient’s aesthetics. In this case, after adenoids surgery, the patient should have no problem with nasal ventilation, and then can wear a mouth breathing correction device to correct the patient’s habit of open mouth breathing and the muscle habit of the mouth and lips, so that the patient can gradually change the bad habit of open mouth breathing, thus slowly restoring the patient’s facial appearance.