When a tooth is swollen after extraction, the first thing to distinguish is whether the swelling is normal physiological swelling or postoperative infection. Generally speaking, for more traumatic tooth extractions, such as the extraction of buried wisdom teeth, the process of extraction involves the incision of gums, flaps, removal of alveolar bone and tooth division, which takes longer and is more traumatic, there will be a normal physiological swelling and pain process after the operation. This process usually reaches a peak of swelling on the second to third day, and then gradually subsides in about 7 to 10 days. The whole process is a physiologically normal process and generally does not require excessive intervention. If the swelling is really obvious, some hormones can be applied symptomatically to relieve the swelling. However, if this is not the case, it is more than 3 days after tooth extraction and the swelling in the wound area continues to increase, accompanied by severe pain in the wound and a bad taste in the mouth. Then it is possible that there is a post-extraction infection and it is necessary to visit the dentist again. Open drainage is performed for the extraction wound to flush out the pus, and systemic antibiotics are applied to control the infection and prevent it from spreading, and generally the swelling will be eliminated after the infection is controlled.