Half an hour after wisdom tooth extraction is the time when the blood clot starts to form. Theoretically, there will be normal blood seepage from the wound during this period, but during the corresponding period, the extraction doctor will ask the patient to bite sterile cotton balls or cotton rolls tightly on the wound site, so there will be no obvious bleeding during this period. After this period, it is also normal to have blood in the sputum within 24 hours after tooth extraction, which means that the patient may spit out sputum with blood in it, and this situation is also normal and there is no need to worry excessively. If it is not these cases, but there is obvious bleeding after tooth extraction, which continues without interruption, it is suggested that the patient should go to the professional stomatology department again as soon as possible to check the extraction wound to see if there is any tearing of the gums or rupture of small blood vessels, and if necessary, secondary treatment can be carried out for the extraction wound, or the extraction wound can be closed directly with stitches, and most of the bleeding from the extraction wound will stop after the closure.