The formation of a cavity after wisdom tooth extraction, often referred to as an extraction wound, is a normal phenomenon. In general, patients only need to do routine hygiene cleaning without too much special treatment and will recover on their own after a period of time. If it does not recover on its own, patients are advised to go to the hospital for professional treatment in time. For the extraction wound formed after wisdom tooth extraction, you should not brush or rinse your mouth for 24 hours, and should not clean the cavity to prevent the blood clot from falling off, and pay attention to the food should be warm and cool, fine and soft, and should not do sucking action. 24 hours later, if there is food residue left in the cavity, it is not recommended to use toothpicks, probes and other substances to remove it, which may cause the risk of bleeding and infection, and can be cleaned by gentle brushing and rinsing for cleaning. After a period of time, granulation tissue may appear in the cavity, but the patient does not have to worry too much about it, it is a normal growth of the tissue and the patient does not need to clean it. If the cavity is infected, it is recommended that the patient go to a regular hospital dentistry department for cleaning, such as using hydrogen peroxide and saline alternately to rinse the cavity to clean out the necrotic tissue or food residue. Then anti-inflammatory treatment, such as the use of iodoform gauze on the wound, patients with serious inflammation can also be treated with anti-inflammatory drugs such as cephalosporin and penicillin under medical advice. Patients are advised to maintain oral hygiene after wisdom tooth extraction and avoid eating spicy and stimulating foods as much as possible to avoid affecting the healing of the wound.