After tooth extraction, be careful not to brush or rinse your mouth on the same day and eat soft food for three days to avoid dislodging the newly formed blood clot. Precautions after tooth extraction include pressure to stop bleeding, brushing and rinsing, and eating and drinking. First of all, pressure to stop bleeding within half an hour after tooth extraction can be done by biting cotton balls and gauze, and it is necessary to bite firmly to stop bleeding. After half an hour, spit out the cotton ball or gauze to stop the bleeding. Next, brush and rinse your mouth. You should not brush your teeth or rinse your mouth within 24 hours after tooth extraction to avoid bleeding again and infection caused by the blood clot. It is normal if there is a small amount of blood in the saliva within one day after tooth extraction. After twenty-four hours after tooth extraction, you can gently brush your teeth, avoiding the location of the extraction wound as much as possible. Gently rinse your mouth, do not drum hard, do not suck on the wound, and do not lick the wound to avoid dislodging the newly formed blood clot. You should also pay attention to the diet after tooth extraction, try to eat liquid food for three days after tooth extraction, do not eat hard things or hot food, all to protect the newly formed blood clot from bacterial infection of the extraction wound. Try to eat a light diet within three days after tooth extraction, do not eat spicy and stimulating food, and do not eat seafood and other foods to avoid wound infection. So bite cotton ball or gauze for half an hour to stop the bleeding after tooth extraction, do not brush your teeth or rinse your mouth on the day after tooth extraction, eat a liquid diet for three days and do not eat spicy and stimulating food.