With the development of social economy, there is a significant increase in the incidence of obstructive sleep apnea hypoventilation syndrome (OSAHS), which is characterized by recurrent obstruction of the upper airway during sleep, causing apnea, hypoventilation and sleep disorders, generally manifested as sleep snoring, hypoxemia and daytime sleepiness. In recent years, with the in-depth multidisciplinary research, OSAHS is considered as a possible cause of cardiovascular diseases such as hypertension, pulmonary heart disease and cerebral obstruction, and patients with OSAHS occupy medical resources and have a significantly higher incidence of traffic accidents than normal people, so the diagnosis and treatment of OSAHS patients at home and abroad are increasingly important. At present, there are three main treatment methods for OSAHS. i. Continuous positive pressure ventilation therapy (ventilator). Second, surgical treatment: such as tonsil adenoid removal, nasal surgery, linguopharyngoplasty and oral orthognathic surgery. Third, oral orthodontic appliance treatment: foreign countries began to apply a large number of oral orthodontic appliances to treat OSAHS in the 1980s, and in 1993 the North Medical and Dental Hospital took the lead in carrying out the clinical work in China. Oral appliances are suitable for simple snorers and patients with mild to moderate OSAHS. In addition, oral appliances are a better choice for those patients who refuse or cannot tolerate ventilator treatment or relapse after surgical treatment. Oral appliances can be classified into three types based on the site of action, namely oral appliances that act directly on the tongue, oral appliances that act on the lower jaw and bring the lower jaw forward, and oral appliances that act on the soft palate and elevate it. The most clinically used oral appliance is the mandibular advancement type of oral appliance, which is generally referred to as the mandibular advancement appliance. Oral orthodontic appliances are gradually being accepted by the majority of patients because of their portability, comfort and tolerability, low cost and noiselessness, non-invasiveness and reversibility of treatment. Oral orthoses are personalized according to the patient’s dental model and are worn when the patient sleeps, allowing the mandible and tongue to be displaced forward and downward, opening the airway and relieving airway obstruction, thus improving ventilation. Initially, patients wearing oral orthodontic appliances may experience varying degrees of temporomandibular joint and muscle pain, tooth soreness, increased salivation and other uncomfortable symptoms, which are generally relieved by gradual adaptation after one to two weeks of continuous use. Currently, the objective efficiency of oral appliances for OSAHS is 88.2% and the subjective efficiency is 93.3% as reported in China. Patients’ snoring is eliminated or significantly reduced after wearing the appliance, and their mental state of daytime fatigue and drowsiness is significantly improved, and their work efficiency and quality of life are significantly improved, which is also conducive to the control of hypertension, diabetes and other complications. Oral snoring obstruction treatment specialist diagnosis and treatment process: I. Patients undergo oral specialist examination, take lateral X-ray of the head to determine the location of the obstruction plane, and request consultation with ENT and respiratory medicine if necessary. Second, the patient is recommended to undergo polysomnography monitoring to confirm the diagnosis and evaluate the severity of the disease. If the patient is a patient with OSAHS indication for oral orthodontic appliance treatment, take a jaw model, determine the position of the lower jaw, make an oral orthodontic appliance, and ask the patient to wear it during sleep. The patient is advised to wear the orthodontic appliance for polysomnography monitoring to evaluate its objective efficacy.