1. After tooth extraction, the doctor will ask the patient to bite down on the cotton ball, which serves to compress and stop the bleeding and protect the wound. Generally the cotton ball can be spit out about 30-40 minutes after tooth extraction. 2. Under normal circumstances, the bleeding will stop after the cotton ball is spat out. It is normal to have a little blood in the saliva, but it is not normal if you spit out blood in a big mouth, so you should follow up in time or go to the nearest hospital stomatology department for emergency treatment. 3. After tooth extraction, pay attention to protect the blood clot, do not rinse your mouth, do not chew food with the side of tooth extraction, do not lick the wound frequently, and do not suck and spit repeatedly so as not to destroy the blood clot due to the increase of negative pressure in the mouth. 4. Generally, you can not take medicine after tooth extraction. However, when the tooth is extracted during the acute inflammation period, or when the trauma is large and the general condition is poor, some oral antibiotics and painkillers should be taken. 5. After tooth extraction, it does not affect work and you can go to work as usual, but do not engage in heavy physical labor. Smoking and drinking have bad effects on wound healing, so it is better not to smoke or drink within one or two days after tooth extraction. 6. If you still have swelling and pain after 3-4 days after tooth extraction, you should go to the hospital for consultation. After the extraction of complex blocked wisdom teeth, there are often swelling, pain, difficulty in opening and painful swallowing. Cold compresses should be applied immediately at this time. For those with sutures and iodoform gauze, a cold towel can be applied to the patient’s face repeatedly for 15 minutes every hour for 3-5 times after surgery.