Twelve hours after extraction, if there is a small amount of blood seepage, it is a very normal situation and does not need to be treated. If there is more than one bleeding, a prompt visit to the dentist is required. First of all, it is necessary to suspect whether the clot in the extraction socket has been dislodged, for example, the patient often likes to spit after spitting out the cotton ball, or chewing with the affected side, bringing out the clot, or carelessly brushing the teeth or having the habit of smoking, which may cause the extraction socket to bleed again. Of course, it cannot be ruled out that the patient himself suffers from blood-related diseases, and simple hemostasis is often not very effective and requires the application of medication to stop the bleeding. If the patient’s blood pressure is not controlled and very high before the extraction, it is likely that bleeding will occur after the extraction procedure. Therefore, it is important to measure the blood pressure before tooth extraction to make sure that the low pressure is below 100 mmHg and the high pressure is below 180 mmHg before the tooth can be extracted normally.