The routine procedure of tooth extraction is to first inject local anesthetic around the extracted tooth, then separate the gums with a gingival separator, use special instruments for tooth extraction, wedge the extraction jaws into the gap between the tooth and the alveolar bone, loosen the affected tooth, and finally use extraction forceps to remove the affected tooth and reset the alveolar bone, place a cotton ball or gauze on the extraction wound site and ask the patient to bite firmly to stop the bleeding, usually for 30-60 minutes. The patient is instructed to bite firmly to stop the bleeding, usually for 30-60 minutes. In the case of extraction of obstructed wisdom teeth or buried teeth, the extraction operation is more complicated, requiring incision of the mucosa, lifting of the tissue flap, debridement and division of the tooth before the tooth can be extracted in pieces and finally the mucosa is sutured in alignment at the extraction wound site.