It takes about 30 minutes to 3 hours for the anesthesia to wear off after tooth extraction, depending on the way of anesthesia. 1. Local infiltration anesthesia: If the patient chooses local infiltration anesthesia when extracting teeth, usually choose lidocaine injection, most need about 30 minutes interval, the anesthesia will be invalidated, but it will be affected by the individual’s physical condition and the dose of anesthesia. 2. Nerve block anesthesia: If patients choose the way of nerve tissue anesthesia when extracting teeth, usually need to choose to use procaine injection, most of the anesthesia time in 2~3 hours, of course, the injection of different doses of anesthetic, after extraction of teeth, anesthesia strength of the expiration time will also be slightly different. It is recommended that patients should go to the local regular hospital stomatology department for treatment of tooth extraction, operated by a professional experienced doctor, and do a good job of postoperative care.