Oral and maxillofacial surgery is a sub-discipline of dentistry, mainly studying oral organs, including teeth, lips, tongue, palate, pharynx and other facial skin and soft tissues, maxillofacial bones such as maxilla, mandible, zygomatic bone, temporomandibular joint, salivary gland and certain diseases of the neck as the main content of the discipline. Oral and maxillofacial surgery involves a wide range of treatment, simply put, in addition to eye, ear, nose, throat, cranial and thyroid diseases, other parts of the disease such as maxillofacial tumors, trauma, infection, congenital deformities, etc. Oral and maxillofacial surgery may involve, for example, some people have long lumps on the face, neck or mouth, some people can not bite normally because of trauma, some people can not open their mouths because of congenital or acquired factors. Some people have facial bone or soft tissue deformities due to congenital or acquired factors, etc. All of these conditions can be treated in the oral and maxillofacial surgery department. In addition to the above-mentioned common illnesses and diseases, salivary gland diseases such as mumps, facial nerve disorders such as trigeminal neuralgia, oral and maxillofacial inflammatory diseases such as wisdom teeth, pericoronitis and tooth extraction are all within the scope of oral and maxillofacial surgery treatment.