The third day of tooth extraction is more painful than the second day, if the pain is very intense and has radiated to the ear temporal region, it may be suffering from dry socket syndrome, which is commonly seen in the extraction of mandibular wisdom teeth or teeth in the lower jaw that are more difficult to extract. Because the trauma caused by the operation is relatively large, the patient did not have good protection of the extraction wound after the operation, resulting in the shedding of blood clots in the extraction wound and the sense of dry socket, the main symptom is that three days after the extraction of the tooth, there will be severe pain, and the extraction fossa is very empty, there is no newborn tissue, but instead of gray-white corrosive granulation tissue. After the emergence of dry socket patients can take oral painkillers at home to relieve pain, such as oral fen-phen, at the same time to take antibiotics to anti-inflammatory, such as cephalosporin, amoxicillin and metronidazole tablets, dental extraction of localized but also to go to the hospital, the doctor should be thorough on the extraction of the socket debridement, to get rid of infected and corroded granulation tissue, and to promote the healing of the new tissues.