Smelly mouth is a bad smell emanating from the mouth, common causes of oral ulcers, stomach diseases, consumption of certain foods containing odor, etc., for the treatment of smelly mouth, you can scrape the tongue under the guidance of a doctor, take oral gargle and so on, it is recommended to go to the hospital stomatology department, under the guidance of the doctor to the cause of the treatment. 1. Mouth ulcers: generally refers to the oral mucosa broken to form ulcers, there will be symptoms of bad breath, can be prescribed by the application of chlorhexidine gargle anti-inflammatory treatment, can also be prescribed by the doctor to scrape the tongue. 2. gastric disease: generally refers to gastritis, gastric ulcer and other diseases, due to Helicobacter pylori infection or gastric mucosal damage and the emergence of bad breath, need to treat the primary disease, such as the application of proton pump inhibitors (such as omeprazole, lansoprazole, etc.), antibiotics (clarithromycin, amoxicillin, etc.), bismuth (bismuth pectin, bismuth citrate, potassium, etc.), etc. for treatment. 3. Consumption of certain foods containing odor: such as green onion, garlic, durian, etc., there will be bad breath, can be relieved after brushing the teeth, but also chewing gum, to alleviate the bad breath. It is difficult to relieve bad breath, or other discomforts, you should consult a doctor in time, and follow the doctor’s instructions for treatment.