The precautions after wisdom teeth extraction can be basically divided into postoperative hemostasis, dietary problems, hygiene care and special situation treatment and so on. 1. Postoperative hemostasis: generally after wisdom teeth extraction, you need to place a sterile medical cotton ball in the location of the extraction wound to stop bleeding by biting and pressing for about thirty to forty minutes, and at the same time, you need to pay attention to avoid rinsing the mouth and spitting and other actions, to prevent the wound from shedding blood clots within the wound resulting in bleeding more than the problem of the wound. 2. Diet: generally after wisdom teeth extraction, 2 hours after you can eat, but need to pay attention to try to fluid or semi-fluid food, to prevent food too hard on the wound trauma, but also need to pay attention to the food temperature can not be too high, to prevent bleeding and infection of the wound. 3. Hygiene care: it is generally recommended not to brush your teeth or rinse your mouth on the day of wisdom teeth extraction to prevent the blood clot from falling off or traumatizing the wound, and try to avoid the location of the wound 24 hours later by using lukewarm or lightly salted water for brushing or rinsing the teeth or rinsing the mouth. 4. Treatment of special circumstances: after the extraction of wisdom teeth, if the wound bleeding and pain and other special circumstances, it is best to go to the hospital stomatology department in time to find a doctor to deal with.