Stomatologists mainly diagnose, treat, repair and prevent common oral diseases and frequently-occurring diseases. The treatment of oral diseases requires more operations than the diagnosis, and accurate surgical treatment technology is the key to the diagnosis and treatment of oral diseases. The diagnosis and treatment of oral diseases integrate examination, diagnosis, health care and treatment. Most of the diagnosis and treatment methods are single-person local operation, and there are few systemic drugs, which puts high operational requirements on dentists. Dentists' duties include not only oral restoration, cleaning and tooth implantation, but also the prevention and treatment of dental pulp, periodontal diseases and various oral mucosal diseases, radical surgery of oral and maxillofacial tumors, cleft lip and palate repair (rabbit lip repair), orthodontics and orthognathic surgery to correct "ground" deformity (buck teeth repair) and so on. There are very few inpatients in stomatology, almost all of them are outpatients, so dentists can avoid the pain of night shift.