Extraction of complex teeth (including buried teeth, blocked teeth, split teeth, dead pulp teeth, etc.) is a more complex, traumatic, postoperative local reactions and complications dental surgery in extraction. 2. Postoperative bleeding, which requires exclusion of hematological system or jawbone hemangioma lesions and the use of hemostatic drugs or surgical sutures, and if necessary, observation or blood transfusion in the hospital. 3.Facial swelling and pain, restricted opening, painful swallowing, etc. must be reviewed in hospital in several days after surgery, and symptomatic treatment should be taken, and the above symptoms may last longer in special cases. 4.Postoperative infection, dry sulcus, need regular change of medicine, antibacterial and other treatment. 5, postoperative sometimes half side of the lower lip numbness or tongue numbness, the duration is variable, give drugs, physiotherapy, etc. 6, the posterior maxillary teeth and maxillary sinus close to the root, the root may enter the maxillary sinus need to surgically remove the root, and then perform maxillary sinus fistula repair. 7, other surgical accidents such as damage to adjacent teeth, s adjacent tissues and complications, symptomatic treatment.