Under normal circumstances, the pain after tooth extraction will last for 3~5 days, if the wound is too large or dry socket, the pain time may be extended, as follows. 1. Too large a wound: too large an extraction wound may lead to the blood clot is easy to break down and fall off, the alveolar bone wall of the nerve endings are exposed, the stimulation will cause pain. A large wound also heals more slowly and is painful for a longer period of time. 2. Dry socket: usually 2~3 days after tooth extraction causes severe pain, and will radiate to the top of the head, ear temporal, mandibular area, general analgesic drugs can not stop the pain, can be seen in the extraction of empty sockets or corruption of degeneration of blood clots, there is a strong putrid smell, at this time it is difficult to relieve the pain by itself, you need to go to the hospital for treatment. If the pain after tooth extraction is serious or accompanied by other symptoms, it is recommended to go to the hospital in time, after clarifying the cause for targeted treatment.