When there is an infection after tooth extraction, anti-infection treatment is needed immediately to prevent further aggravation of the infection. In this case, it is first recommended to go to a professional dentistry department and be guided by a professional dentist for anti-infection treatment, who will check the symptoms and severity of the infection and then make symptomatic treatment. Generally, infection after tooth extraction occurs more than 3 days after tooth extraction, and clinical examination reveals that it is accompanied by obvious redness, swelling and pus overflowing in the extraction wound, as well as more intense pain, sometimes accompanied by oral odor and mouth opening restriction, and other symptoms. In this case, local treatment combined with systemic anti-inflammatory medication is required. Local treatment may include drainage of pus from the infected area of the extraction wound and, if necessary, secondary cleaning and scraping of the alveolar socket. For systemic treatment, if bacterial culture and drug sensitivity tests are available, anti-inflammatory drugs are most effective when applied to the causative organism. However, in many clinical cases, there is no obvious pus, or there is no condition to do such test, so empirical medication is usually used to control the infection of the extraction wound by applying broad-spectrum cephalosporin antibiotics in combination with nitroimidazole antibiotics.