It is not normal that the tooth is still painful after three days of extraction, it may be a wound infection. It is generally recommended to take oral anti-inflammatory drugs after surgery, such as cephalosporin, amoxicillin, roxithromycin, erythromycin, and with metronidazole tablets and ornidazole tablets, which can fight against anaerobic bacterial infections and facilitate wound healing to avoid wound infection or fever. In addition, if the pain starts to appear only after three days of extraction and the pain is more intense, it may be a phenomenon of dry socket. In this case, it is usually necessary to go to the stomatology department for treatment by the doctor, which can be done by scraping, additional rinsing, local medication such as iodoform and gauze in the cavity, which can promote the healing of the wound and avoid the infection of food embedded in the cavity. In addition, do not eat spicy and stimulating food, do not drink alcohol and do not smoke after surgery, so as to facilitate the healing of the wound.