Tooth extraction is the most commonly performed minor surgery in dentistry, but sometimes it can lead to accidents, bringing undue loss and pain, and in severe cases, life-threatening. Therefore, before tooth extraction requires both physical preparation, but also psychological preparation. Many patients are anxious and fearful of tooth extraction, avoiding it due to nervousness and fear, or failing to cooperate with the dentist or even fainting during the extraction process. We should know the following precautions before tooth extraction: tooth extraction is contraindicated in one of the following cases: (1) If the patient is accompanied by other systemic diseases, especially hypertension, coronary heart disease, etc., which may lead to serious complications, or even life-threatening. (2) Bleeding disorders: such as hemophilia, primary thrombocytopenic purpura patients, the body’s coagulation process is impaired, so there is a tendency to bleed. (3) Menstruation, pregnancy, breastfeeding: women should avoid tooth extraction in principle during menstruation because compensatory bleeding may occur in the tooth socket during menstruation. (4) Severe hepatic and renal impairment and active liver disease. (5) Malignant tumors and psychiatric episodes should be avoided. (6) Before the symptoms of diabetes are controlled. (7) After strenuous exercise, labor, or drinking alcohol, tooth extraction should not be performed. (8) People with a history of allergy to procaine anesthetics (some can be changed to acupressure, needle anesthesia). (9) Cold and inflammatory period of patients also need to be cautious of tooth extraction. What should we pay attention to after tooth extraction: (1) First of all, the most crucial thing is to calm down and listen carefully to the doctor’s explanation after tooth extraction, which is very important. (2) It is best not to eat within two hours, the same day to eat soft food, warm and cold is preferred, can be used on the other side of the chewing. (3) Do not rinse your mouth or spit much on that day to prevent bleeding or infection. Do not repeatedly suck and spit off the blood clot because of the smell of blood in the mouth, which may cause the wound not to heal. (4) Do not brush your teeth on the same day. Because about 24 hours after tooth extraction, the local fibroblast cells just extend and grow from the alveolar bone wall to the blood clot, and gradually make the blood clot mechanized and become solid and sturdy. If you rush to rinse and brush your teeth, you may rinse out the blood clot, brush it off and cause bleeding again, or cause the socket to be empty and lead to intolerable pain, “dry socket”, prolonging the healing time. (5) Within 1 week after tooth extraction, it is normal to have blood in saliva, if there is more than one bleeding, go to the hospital for examination. (6) On the day of tooth extraction, try to do less exercise and talk less. Avoid tobacco, alcohol and spicy food. (7) If there are sutures in the mouth when the tooth is extracted, the sutures can be removed only after 4~5 days. (8) After tooth extraction, you should bite the sterilized cotton ball or gauze pressed on the wound to achieve the purpose of pressing the wound and helping to stop bleeding, and hold on to it for 30 minutes before spitting it out, don’t bite it too tightly or bite it for too long. (9) General tooth extraction can be done without oral routine antimicrobials, and a slight fever is normal after a difficult tooth extraction. (11) 2 to 3 months after the extraction of teeth should be set in time (in addition to blocked teeth), in order to avoid the neighboring teeth collapse.