Small, minimally localized emphysema in extracted teeth occurs from time to time, mainly in cases of incisional extractions and more complex operations. The incidence of maxillofacial multi-gap emphysema is rarely reported clinically, and is associated with the coexistence of emphysema and postoperative reactive swelling, and the clinical manifestations are not easy to distinguish. It mainly occurs after extraction of mandibular obstructed 3rd molar, mostly due to too deep buccal incision, too extensive mucoperiosteal stripping, too much alveolar bone removal, and patient’s coughing after wound closure. Prevention should avoid too deep incision, too large flap, too much bone removal, and the wound should be placed with iodoform gauze for drainage after suture closure. Once subcutaneous emphysema occurs, sutures should be removed, drainage strips should be relocated, and localized pressure bandage and infection control should be applied. What are the dietary considerations for subcutaneous emphysema after tooth extraction? Generally, you need to bite on a cotton ball for 40 minutes after wisdom tooth extraction, you can eat after 2 hours (some recommend to eat after 4 hours), and you can brush your teeth after 24 hours. Regarding the precautions to be taken for tooth extraction, the dentist will instruct the dentist, and here we will mainly talk to you about the dietary aspects. The day of tooth extraction is generally warm and cool fluids, semi-fluids, do not eat hot hard food, then we can choose from: thick rice soup, steamed egg custard, milk, yogurt, fresh fruit juice, a variety of congee, wontons, fluffy steamed food, fruit and vegetable soup, fish and meat broths (soup and meat, I do not advocate only soup, will be stewed in small pieces of meat is very bad, the correct soup is to eat meat with a small amount of broth), soft rice, soya bean milk, tofu brains etc. Summer tooth extraction, choose an ice cream is a treat for the teeth, cooler things to eat, will indeed feel more comfortable, but the choice of ice cream to choose the taste is not too sweet, more delicate and raw materials better varieties, yogurt ice cream is a good choice, of course, 1 day 1 can also be.