Smoking is not allowed for tooth extraction. Tobacco contains many chemicals, such as nicotine, which can have an effect on wound healing and increase the likelihood of wound bleeding. Smoking after tooth extraction is detrimental to the growth of local granulation tissue, secondary to bleeding, hematoma and inflammatory infection. Smoking may also cause the alveolar fossa blood clot detachment, triggering bleeding. Oral bacteria cause infection of the extraction wound, severe dry socket, severe pain in the extraction area, alveolar fossa peculiar malodor. Therefore, do not smoke after tooth extraction, it is best to quit smoking. After tooth extraction, pay attention to light diet, do not eat too hot food, to promote the healing of the extraction wound, reduce the risk of infection.