Precautions after tooth extraction include not rinsing and brushing teeth on the day of extraction, eating a semi-liquid diet, and observing the bleeding and pain of the wound. 1. On the day of extraction (within 24 hours), you should pay attention to not rinsing and brushing your teeth, and do not lick or suck the wound with your tongue to avoid dislodging the blood clot in the wound after extraction. 2. No food and water should be allowed 2 hours after tooth extraction. On the same day, attention should be paid to diet, try to eat semi-liquid or soft food, and the food should not be too hot, and avoid using the side of the extracted tooth for chewing. 3. On the day after tooth extraction, there may be blood in the saliva, which is a normal phenomenon. However, if a large amount of blood comes out, you need to consult a doctor immediately for diagnosis and treatment. 4. After tooth extraction, when the anesthesia disappears, the patient may feel pain, and if necessary, ibuprofen and other drugs can be used for pain relief. If there are 2~3 days after the extraction of the pain again. And gradually aggravate the situation, may have occurred secondary infection, it is recommended to consult a doctor. The use of specific drugs need to be under the guidance of the doctor.