Oral and maxillofacial surgery is a branch of dentistry, which focuses on the diagnosis and treatment of certain diseases related to the oral organs (teeth, alveolar bone, lips, cheeks, tongue, palate, pharynx, etc.), facial soft tissues, maxillofacial bones (maxilla, mandible, zygomatic arch, orbit, nasal bone), temporomandibular joint, salivary glands (parotid, submandibular, sublingual, small mucus glands), and the first level of the neck as the main content. It is an important part of dentistry. It is an important part of dentistry and also an important branch of clinical medicine, which intersects with ophthalmology, otorhinolaryngology, neurosurgery, plastic surgery, general surgery and many other disciplines in the clinical work. Oral and maxillofacial surgery in China began after the liberation, relatively late development, due to the broader scope, often not understood by patients. In clinical work, the main treatment diseases of oral and maxillofacial surgery include the following: 1, minimally invasive tooth extraction and alveolar surgery; 2, oral implant surgery; 3, oral and maxillofacial jaw fractures and serious trauma emergency; treatment of soft tissue trauma of the maxillofacial area, treatment of various maxillofacial fractures, such as upper and lower jaws, zygomatic bone zygomatic arch, frontal bone, orbital and nasal orbital sieve compound fractures; 4, head and neck and oral and maxillofacial benign, malignant tumors and 4, head, neck and oral and maxillofacial benign and malignant tumor radical surgery and defect microsurgery repair and reconstruction, such as parotid cancer, tongue cancer, cheek cancer, jaw cancer …… various cysts, hemangioma, etc.; 5, congenital cleft lip (harelip), cleft palate, craniomaxillofacial contouring and cosmetic surgery; 6, infection diagnosis and treatment, such as facial and neck abscess, jaw osteomyelitis, mumps, pericoronitis; 7, Treatment of neurological disorders, such as trigeminal neuralgia, facial nerve paralysis and spasm, etc.; 8. Diagnosis and treatment of temporomandibular joint disorders; 9. Surgical treatment of severe snoring (obstructive sleep apnea syndrome).