Precautions after tooth extraction: 1. Generally do not rinse your mouth, let alone brush your teeth within 24 hours after tooth extraction. Because about 24 hours after tooth extraction, the local fibroblasts just extend from the alveolar bone wall to the blood clot, and gradually make the blood clot mechanized and become strong and solid. If you rush to rinse and brush your teeth, it is possible to rinse and brush off the blood clot and cause rebleeding, or cause “dry socket” with unbearable pain due to emptying of the tooth socket, which prolongs the healing time. Care should also be taken not to lick the wound with tongue or suck the wound with force to prevent infection caused by wound injury or dislodging of blood clots on the wound, which may affect the clotting process and cause continuous bleeding. 2. Follow the medical advice and bite the sterilized cotton ball or gauze pressed on the wound after tooth extraction to achieve the purpose of compressing the wound and helping to stop bleeding, and stick to it for half an hour before spitting it out. This is because the blood in the wound after tooth extraction may form a blood clot within half an hour. If you spit out the cotton ball or gauze in advance, bleeding will easily occur. Do not touch the wound with your fingers after tooth extraction because there are a lot of pathogenic microorganisms on your fingers, which can easily cause infection of the extraction wound and also destroy the formed blood clot. 3, two hours after tooth extraction can eat, but should pay attention to eat some liquid food, do not drink hot water or eat too hot, too hard food. Hot food will cause vasodilation and easy bleeding; too hard food is a mechanical stimulus to the wound, which can cause bleeding and aggravate the injury, so it should be avoided. 4. Do not smoke for several days after tooth extraction because the smoke of cigarettes can have harmful stimulating effects on the extraction wound and affect the coagulation process, and do not drink alcohol or eat spicy food to avoid aggravating pain or bleeding. Do not use unsterilized paper, cotton, tooth powder, etc. to insert into the extraction wound. 5. Medication should be used under the guidance of a doctor. It is normal to have slight pain after tooth extraction, and pain relief tablets can be taken as appropriate. 6. If the wound bleeds more than once or spits out blood clots from time to time after tooth extraction, simple methods can be taken to stop bleeding, such as applying a clean cold towel or gauze dipped in ice water to the face of the tooth extraction side, the local blood vessels will contract on their own when they encounter cold stimulation and stop bleeding. You can also stop the bleeding by stuffing a sterile cotton ball or gauze on the wound and biting down slightly. If it cannot be controlled, ask a doctor to handle it as soon as possible.