The bad breath may be caused by indigestion, Candida albicans infection, etc. It can be treated with drugs such as gastrointestinal tablets and ketoconazole under the guidance of a doctor. 1. indigestion: if the patient has indigestion, food can not be quickly digested and absorbed, may accumulate in the gastrointestinal tract, affecting the body’s normal metabolism, so this symptom will appear, usually under the guidance of the doctor to use gastric tablets, bifidobacteria and other drugs to treat. 2. Candida albicans infection: Candida albicans infection can also lead to bad breath on the tongue, you can use sodium bicarbonate gargle rinse mouthwash, at the same time you can use ketoconazole and other antifungal drugs. Usually need to drink more water, more rest, appropriate physical activity, adhere to the morning and evening brushing and gargling after meals, can reduce bad breath. All of the above medications need to be used in accordance with medical advice.