Precautions for tooth extraction: 1. If you have a history of blood clotting disorder, hypertension, heart disease, etc., you should take the initiative to explain to the doctor to draw attention and make emergency preparations. 2. Rinse your mouth with warm salt water before tooth extraction. 3. Do not rinse your mouth on the day after tooth extraction to prevent blood clots from coming out of the extraction incision. 4. If there is more bleeding on the day of tooth extraction or the next day, place a dressing of corresponding size on the trauma. 5. On the second day of tooth extraction, there is still severe pain in the incision, but there is no clot in the incision, but there is filth and odor, which is a complication of limited alveolar fossa osteomyelitis. The wound should be rinsed daily with warm saline and 3% hydrogen peroxide alternately. And place the corresponding size of iodoform gauze with a very small amount of clove oil to fill the wound until it heals water pain. 6. If the bleeding does not stop after tooth extraction, the blood and water in the mouth should be cleaned quickly and the free blood clot above the tooth extraction wound should be removed, then a dressing should be placed on the wound, and if there is still more bleeding, the patient should be treated in hospital. 7. Use mouthwash after meals and before going to bed, gently hold it for 30 seconds and then spit it out slowly to prevent bacterial infection. 8.Take the medicine according to the doctor’s prescription, do not reduce the dose by yourself, otherwise the consequences are unimaginable. 9.Drink more fruit juices to supplement vitamin C and B group to enhance wound healing. 10, always remember to leave the hospital, clinic phone number and the name of the doctor, if there is an emergency situation immediately contact the doctor. 11. Excusing yourself from socializing and drinking, and getting enough rest and sleep are essential. 12. 2 hours after tooth extraction, you can drink water and eat semi-liquid food such as thin rice, thin noodles, etc. Do not eat food that is too hot or too hard, do not drink strong alcohol, do not smoke, and do not eat spicy food.