Wisdom tooth extraction as a more traumatic type of operation in alveolar surgery, it is normal to have bleeding for a certain period of time after the operation, but it is necessary to pay attention to determine whether there is abnormal bleeding or not. Generally, half an hour after wisdom tooth extraction, there will be blood oozing from the extraction wound, which is considered normal at this time. However, at this time, the patient will be made to press a cotton ball or cotton roll in the extraction wound to play the role of local pressure to stop bleeding, which will be removed in about 30 minutes, and it is also normal for blood to appear in the saliva in the mouth 24 hours after the extraction, so the patient is advised not to brush or rinse the mouth, not to lick the extraction wound with the tongue, and not to suck the extraction wound within 24 hours to prevent the blood clot of the extraction wound from falling off and causing secondary bleeding. Therefore, patients are advised not to brush or rinse their teeth and not to lick the extraction wound with their tongues for 24 hours. In a word, it is normal to bleed after tooth extraction, but the amount should not be too large. If there is a continuous large amount of bleeding, it is recommended to go to a professional dental institution to deal with it again as soon as possible.