Smoking is not allowed after tooth extraction; it interferes with wound healing and may also increase the risk of wound infection. Cigarettes are irritating gases that can have a harmful irritating effect on the wound, contaminating the wound and increasing the risk of wound infection. In addition, cigarettes contain a large amount of carbon monoxide, which will change the permeability of the blood vessel wall, so that the coagulation process is impeded, and at the same time, in the process of smoking, the action of sucking this will make the blood clot fall off, affecting the coagulation of blood on the wound surface, which will affect the healing of the wound. To summarize, it is best not to smoke after tooth extraction to avoid adverse consequences, patients should follow the doctor’s instructions, not to eat any stimulating food, to maintain oral health, to promote better wound healing.