It is not recommended to brush teeth on the 1st day of tooth extraction, and the routine medical advice after tooth extraction includes not to brush teeth or rinse mouth, not to lick the extraction wound with tongue, and not to suck the extraction wound to make a negative pressure environment in the mouth for 24 hours. Because the blood clot will reach a relatively stable state within 24 hours, and applying brushing within 24 hours will cause some stimulation to the blood clot in the extraction wound, which may cause the dislodging of the blood clot and secondary bleeding. Therefore, the 1st day after tooth extraction is not a day when brushing will be a problem but a day when there will be some risk of bleeding, and in order to prevent the risk, it is recommended not to brush or rinse your teeth for 24 hours after tooth extraction.