After the extraction of wisdom teeth the second day of pain is weakened, the third day of increased pain is not a normal phenomenon, may be dry socket syndrome. 1. Dry socket syndrome is generally 2~3 days after extraction of teeth extraction trauma intense pain, can be radiated to the head and neck, ear and other areas, some patients will appear in the mouth putrid odor, symptoms usually gradually aggravated, and taking painkillers usually no relief. It is common in wisdom teeth and first molars. 2. The etiology of dry socket is unknown, it may be related to blood clot detachment, trauma, poor blood flow in the jaws, etc. It is necessary to re-clean and scrape the extraction wound after anesthesia, rinse it out repeatedly, and use iodoform gauze to promote the formation of granulation tissue. It is recommended to bite cotton to stop bleeding for half an hour after tooth extraction, and then eat after 2 hours to prevent the blood clot from dislodging. If there is any discomfort, go to the stomatology department of the regular hospital in time.