When there is a wound in the mouth after tooth extraction, it is in a sensitive period because of the wound. At the same time, patients may have gingivitis and swollen gums, so it is recommended not to smoke for 1 week. The harmful substances produced by smoking enter into the wound of tooth extraction and easily cause wound infection. In addition, the toxic substances in smoke are not only harmful to the body, but also to the teeth. Once the smoke enters the surgical location, it can easily lead to local inflammation, causing severe pain, pus in severe cases, and prolonged healing. It may also be accompanied by some complications, such as gingivitis and periodontitis. Patients are advised to eat more fresh fruits and vegetables after tooth extraction to increase the intake of vitamins in the body, as well as to eat foods with high calcium content, which can promote the replenishment of calcium content in the body and have great benefits for the healing of surgical wounds; at the same time, patients are advised to eat some warm, cool and soft foods after tooth extraction, which are conducive to the contraction of blood vessels in the teeth and play a role in stopping bleeding and reducing swelling. To sum up, after tooth extraction, patients are advised not to smoke immediately and not to eat foods that are too hard or too sweet. Take anti-inflammatory drugs on time to prevent the occurrence of infection.