Smoking is not recommended after tooth extraction surgery. First of all, the patient’s mouth is a definite negative pressure environment when smoking, especially if the patient smokes with greater force, which will cause an increase in the relative pressure of the extraction wound. There is a risk that the blood clot in the extraction wound will loosen and bleeding will occur after the extraction wound. This is a risk that is more likely to occur with smoking after tooth extraction, but of course it does not always occur, but it is better to avoid this risk as much as possible. In addition, when a person smokes, the mouth will be an anaerobic environment. Relatively speaking, the tar, nicotine and anaerobic bacteria in tobacco tend to remain in the oral mucosa as well as in the extraction wound, which can cause slow healing and increase the risk of bleeding, infection and dry socket. Finally, tobacco has now been shown to have a definite positive relationship with periodontal tissue, especially periodontitis. The rate of periodontitis is much higher in smokers than in normal people. Therefore, from this perspective, it is entirely appropriate for patients to use tooth extraction as an opportunity to quit tobacco outright.