Bad intestines and stomach. Bad breath is often found in chronic gastritis and gastric ulcer. Attention should be paid to reducing the amount of food and properly treating primary diseases. Generally, omeprazole can be taken to inhibit the secretion of gastric acid, promote gastrointestinal motility, improve gastrointestinal peristalsis, and promote gastric emptying. For example, Xishapili and Moshapili. In daily life, we should pay attention not to overeat, chew carefully and swallow slowly, not to eat raw and cold fruits, not to eat ice cream, ice cream and other foods that promote gastrointestinal dyspepsia. We can also consider using traditional Chinese medicine to improve it. Usually, we can take Xiaochaihu Tang granules to calm the liver and stomach, improve the situation of bad breath, and also consider taking probiotics, It can regulate intestinal flora and improve halitosis.