After tooth extraction, you can wash your hair when the bleeding stops, but the water used for shampooing should not be too hot, in order to protect the blood clot and ensure the normal healing of the wound, as follows. Usually 30 minutes after the extraction of the wound can stop bleeding, and then the formation of blood clots, blood clots are critical to the healing of the extraction wound. The blood clot is essential to the healing of the tooth extraction wound. It usually starts to mechanize around 24 hours after the tooth extraction. Hair can be washed after the wound stops bleeding, but careful maintenance is required as the blood clot is unstable until it has normalized. Using too hot water to wash your hair will increase blood circulation in your head, which may prevent the clot from forming properly, resulting in bleeding, infection, and other symptoms. If you experience any of the above symptoms, you should go to the hospital and receive professional treatment as soon as possible.