After wisdom tooth extraction, you can brush your teeth only after 24 hours. Because the action of brushing and rinsing too much will form a rapid impact in the mouth, causing an increase in the pressure in the mouth, which may lead to the dislodgement of the blood clot in the extraction wound, causing complications such as secondary bleeding, hematoma and infection after the extraction, and aggravating the patient’s pain. However, 24 hours after wisdom tooth extraction, the blood clot in the extraction wound will be relatively stable, and the clot will start to mechanize and gradually form granulation tissue, so it is safer to brush teeth at this time, and the possibility of secondary bleeding after extraction will be reduced. However, the patient must pay attention when brushing the teeth, the action must be gentle and not cause violent impact, otherwise there is also a risk of dislodging the blood clot in the extraction wound.