Spit out the cotton ball after half an hour of tooth extraction, if there is no obvious bleeding, you can drink water. After tooth extraction, you need to bite the cotton ball or gauze for about 30 minutes, the extraction wound will form a blood clot, if you spit out the cotton ball, the extraction wound is not obvious oozing blood or bleeding, you can drink water. However, you need to drink warm or cold water, not higher temperature or hotter water, and can not use a straw to drink, can not use water to rinse the mouth, do not do “sip” action, in order to prevent the formation of the blood clot is dislodged or destroyed, and continue to bleed, affecting the healing of the extraction wound. If you want to eat, you need to wait until 2 hours after the extraction, and you should not eat too hot or too hard food, and you should take fluids or semi-fluids as the main food. It is recommended that after tooth extraction, you must follow the doctor’s instructions, not to brush your teeth and rinse your mouth within 24 hours, do not touch the blood clot, and avoid too hot and spicy stimulating food to prevent delayed healing of the wound.