Clinically, there is no such thing as wisdom tooth extraction. After the relevant examination, it is clear that non-eruptable wisdom teeth or blocked wisdom teeth are more likely to encroach on the adjacent teeth, resulting in misalignment or even the resorption of the roots of the adjacent teeth, which need to be extracted in a timely manner. In order to avoid pericoronitis, pain, facial swelling and other symptoms. If the wisdom tooth erupts normally and there is no cavity or pulpitis, it can not be extracted and can be observed at any time. The so-called wisdom tooth extraction injury usually refers to a series of adverse reactions and complications caused by the possible damage to the dental nerve after wisdom tooth extraction, commonly including postoperative bleeding, gingivitis, pericoronitis, etc.: 1. Postoperative bleeding: it is normal to have a small amount of bleeding after wisdom tooth extraction, but it may also be due to excessive roughness and improper operation of the extraction, resulting in gum tearing, root remnants, rupture of blood vessels, etc., thus causing heavy bleeding; 2. Gingivitis: usually caused by improper operation, contamination of surgical instruments, poor patient resistance and lack of attention to postoperative wound protection, etc.; 3. Pericoronitis: improper postoperative care may lead to inflammation of the soft tissues around the wisdom teeth, resulting in pericoronitis, which may even lead to loss of appetite, eating disorders, fever and headache in severe cases. The above conditions can usually be avoided with adequate communication with the doctor, better post-operative care and attention to cleanliness and hygiene, so patients need to be treated under the guidance of the doctor to ensure oral health.