Usually, we will ask the patient to bite the gauze roll for 30 minutes after tooth extraction, and when the gauze roll is spit out, no more bleeding will be allowed to go home, but the newly formed blood clot will still cause bleeding if not properly taken care of, therefore, we also need to know the correct care after tooth extraction: 1. not to brush and rinse the mouth for 24 hours after tooth extraction; 2. not to eat too hot and hard food after tooth extraction; 3. not to drink alcohol after tooth extraction; 4. rest as much as possible after tooth extraction, and do less or no heavy physical work.