Smoking is generally not allowed after tooth extraction, but only after the wound has completely healed. Tooth extraction is invasive treatment, there will be a local wound, in the wound is not completely healed when smoking, sucking will lead to alveolar fossa bleeding, in serious cases, will also lead to the extraction of the fossa inside the clot shedding, easy to cause wound infection; and tobacco nicotine and tar content is relatively high, smoking will cause nerve excitation leading to pain or persistent bleeding in the wound site symptoms. After tooth extraction, you need to bite a cotton ball to stop bleeding, half an hour later, you can spit out the cotton ball, at this time the formation of blood clots in the extraction socket. 2 hours later, you can eat some light and easy-to-digest food, within 24 hours, you can not brush your teeth or gargle, and do not smoke. After the extraction of teeth should strictly follow the doctor’s instructions for oral care, in order to make the wound recover as soon as possible.