The pain after extraction should be handled according to the specific cause, the common causes of pain are normal reaction after extraction, acute infection, dry socket and so on. 1. Normal reaction after tooth extraction: pain and discomfort usually occur a few days after normal tooth extraction. The pain increases significantly within 12 hours after extraction, after which it begins to subside gradually, and is usually not unbearable severe pain. Pain medication (e.g. ibuprofen) can generally control the pain. 2. Acute infection: If the local trauma of tooth extraction is large, there is a local infection before extraction, and the patient has diabetes, etc., acute infection may occur after tooth extraction. Mostly occurs in the 2nd day after tooth extraction, local or facial pain, swelling and limited mouth opening. Treatment: Postoperative antibiotic treatment such as metronidazole. 3. Dry socket syndrome: Dry socket syndrome is a limited osteitis that occurs in the extraction socket after tooth extraction, and it occurs most often after mandibular wisdom tooth extraction. It is mainly characterized by severe pain that occurs 3~4 days after tooth extraction, not immediately after tooth extraction; the pain often involves the ear and temple on the same side, not limited to the extraction socket. Oral commonly used anti-inflammatory painkillers are often not effective. When this phenomenon occurs, timely medical treatment, by the doctor with hydrogen peroxide and saline rinse and wipe the extraction socket, and then put on the hemostatic analgesic drugs to promote healing (such as iodoform gauze), generally one to two days of pain symptoms will be relieved, and if necessary, need to be again for the change of treatment until the symptoms basically disappeared. After the extraction of the tooth is still painful, especially severe pain, it is recommended to communicate with the competent doctor in a timely manner, in accordance with the doctor’s instructions for medication, should avoid blindly self-medication.