The method of injection of anesthesia for tooth extraction is divided into: 1. When extracting milk teeth that are retained or obviously loose, a cotton swab can be used to dip a small amount of surface anesthetic such as bupivacaine and apply it to the mucosa of the labial and buccal side of the tooth, and the operation can be carried out after 3-5 minutes of drug absorption. 2. When extracting permanent teeth that are obviously loose, local infiltration anesthesia can be performed by picking up the vestibular groove on the labial side of the tooth and pushing in lidocaine or procaine, and the anesthetic effect can be achieved after a few minutes. 3. When extracting complex teeth, block anesthesia should be chosen. maxillary molars need maxillary nodal block anesthesia and palatal major nerve anesthesia, premolars need block anesthesia with nasopalatal nerve, and mandibular teeth need block anesthesia with inferior alveolar nerve, buccal and lingual nerves.