Bad breath may be related to diet, oral diseases, gastrointestinal abnormalities, etc. To remove bad breath, we need to combine its causes and adopt corresponding treatment methods. 1. Dietary adjustments: for the frequent consumption of stimulating foods such as onions, ginger, garlic, stinky tofu, often drink coffee, smoking and drinking, etc., caused by bad breath symptoms. It is recommended to quit smoking and drinking, eat a light diet and avoid stimulating foods. 2. Oral disease: for improper oral cleaning, etc., resulting in the emergence of dental calculus, periodontitis and other oral diseases, caused by bad breath symptoms, combined with the type of disease to give the periodontal sequence treatment to treat the primary disease, and at the same time do a good job of oral hygiene, adhere to the morning and evening brushing, rinsing after meals or flossing in time to clean the teeth and so on. 3. Gastrointestinal abnormalities: for those who often have acid reflux and indigestion, it is necessary to improve the function of the gastrointestinal tract, and it is recommended to give pepsin, multi-enzyme tablets and other medications to regulate, and at the same time, pay attention to the diet to avoid too much grease. The causes of bad breath are many, we need to be clear about the specific causes, and then follow the doctor’s instructions to standardize the treatment, avoid unauthorized use of drugs.