Biting on a cotton roll for half an hour is usually required after wisdom tooth extraction, and if there is active bleeding afterward, pressure is needed to stop the bleeding, gum stitches, and so on. After the wisdom teeth are removed, the doctor will instruct the patient to bite the cotton roll for half an hour. And you can’t brush your teeth or rinse your mouth for 24 hours after removing the cotton roll. If you eat, you need to do so after two hours and chew on the other side. If there is active bleeding afterward, due to dislodgment of the blood clot, the patient can bite the cotton roll again for another half hour. If there is a laceration of the gums and bleeding occurs, it is necessary to perform a gum suture, by which the gum stops bleeding. Wisdom teeth extraction after a hole if active bleeding, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to give targeted treatment or treatment.