Mouth odor is the old people’s saying, the professional term for oral odor, the reasons are more specific as follows: 1, not discharged odor: some patients usually live alone, or do not love to talk, the odor in the mouth rarely discharged, forming oral odor; 2, eating odorous food: some people, such as northerners love to eat garlic, especially raw garlic, in the mouth by bacterial decomposition will form odor; 3, dental caries: bacteria in dental caries will decompose Food residue, producing odor; 4, gastric disease: patients with H. pylori infection, or poor gastric power, ulcers in the stomach, etc., can also appear oral odor; 5, lung abscess: relatively rare, patients have the fishy smell of raw soy in the mouth. Therefore, there is an oral odor need to clarify the cause of the disease first, and after clarifying the cause, treatment for the cause. If it is Helicobacter pylori infection, eradication treatment is needed, gastric ulcer needs to be standardized for mucosal healing treatment, and also the application of drugs that regulate gastrointestinal dynamics. If the problem is oral, you need to pay attention to brush your teeth to maintain a clean mouth, and if it is due to dietary habits, you need to pay attention to brush and rinse your mouth regularly.