Usually, the doctor will ask the patient to bite a cotton ball or gauze tightly after the extraction so that local pressure can be given to reduce the bleeding of the extraction wound, which usually takes 30-40 minutes. If the cotton ball or gauze is spit out after 30-40 minutes and there is only a small amount of blood seepage, it is usually normal and may last 1-2 days. If there is still active bleeding, it is considered to be bleeding after tooth extraction, and it needs to be promptly stopped by the right cause as well as symptomatic bleeding. 1. The cause of bleeding after tooth extraction may be that the patient did not bite the cotton ball tightly or there is a sucking wound in the middle, and it needs local ice, and at the same time, the patient should visit the stomatology department as soon as possible to stop the bleeding by compression again; 2. If it is found after examination that the bleeding is more than caused by gum tearing, it needs to be sutured by the doctor to stop the bleeding; 3 If the patient has chronic diseases such as hypertension, diabetes, or is menstruating or taking anticoagulant drugs for a long time, and keeps bleeding after tooth extraction, it is recommended to go to the hospital immediately for further treatment, and usually requires the application of warfarin, phenolsulfonamide and other drugs to stop the bleeding; 4. If the patient keeps bleeding after tooth extraction, but the amount of bleeding is not very large, it may also be caused by granulation tissue left in the alveolar sockets after tooth extraction or infection of the extraction wound. If the bleeding keeps on bleeding but the amount of bleeding is not very large, it may also be caused by the infection of the socket or the extraction wound after extraction. After tooth extraction, the doctor will usually advise not to rinse or brush the teeth for 24 hours, avoid sucking the wound, do not eat too hot, too hard or spicy stimulating food, and eat mainly warm, cool and soft food. In addition, local intermittent cold compresses can be applied, usually for 1-2 days, to help constrict the blood vessels to reduce bleeding.