Yellow tongue and bad breath may be caused by poor oral hygiene, improper diet, Helicobacter pylori infection, etc. Patients can be treated by strengthening oral hygiene, oral gastric stimulating drugs and anti-inflammatory drugs. 1. Poor oral hygiene: poor long-term hygiene habits, do not seriously brush the teeth, gargle, tongue above the food debris breeding bacteria, resulting in yellow tongue thick halitosis. Usually it will be relieved after a light diet and change of work and rest. 2. Improper diet: If patients eat too much spicy, stimulating, greasy food, it may lead to gastrointestinal dyspepsia, resulting in bad breath and yellow tongue coating. Patients can take oral mosapride tablets, domperidone tablets and other drugs as prescribed by the doctor for treatment. 3. Helicobacter pylori infection: that is, the bacterial colony in the oral cavity, stomach breeding, will lead to oral and stomach inflammatory lesions, there will be bad breath accompanied by the phenomenon of yellow tongue coating. Patients can follow the doctor’s instructions to choose amoxicillin, clarithromycin, omeprazole combined medication for treatment. Long-term yellow tongue bad breath, will give the patient physical and mental harm, it is recommended to go to the hospital in time, clear cause under the guidance of the doctor reasonable treatment.