Facial swelling after wisdom tooth extraction is a normal physiological manifestation in most cases and is generally common in more traumatic wisdom tooth extractions. If the wisdom teeth are clinically very simple, the extraction process is quick and the extraction trauma is small, there is less side effect after extraction for this type of teeth and sometimes there is no significant swelling. However, if the wisdom teeth are clinically ambiguous and obstructed, the gingival incision and flap removal is required for this type of wisdom teeth, and the tooth debridement and division of the tooth is required, the chance of postoperative swelling will be significantly increased. In general, postoperative swelling has a process of development and decreasing, and it is not the most obvious swelling just after tooth extraction, but usually the swelling will develop to a peak on the second to third day after tooth extraction, and then it will gradually dissipate, and the swelling will be gradually dissipated in about a week. This is the process of physiological post-operative swelling, but if the facial swelling continues to increase more than three days after tooth extraction, accompanied by severe pain of the extraction wound, it must be alerted that it is possible that the swelling is not simply physiological post-operative, but there is a post-extraction infection, which needs to be treated in a professional dentistry department as soon as possible.