Bad breath may be due to oral diseases, H. pylori infection, food accumulation, etc. It can be removed by improving lifestyle, medication (such as penicillin, clarithromycin, amoxicillin) and so on. 1. Oral disease: If there are caries, gingivitis, etc., then it may be due to bacterial growth leading to the appearance of bad breath, at this time you can be scaling, antibiotics for antibacterial treatment of bad breath may improve, and do a good job of daily oral hygiene. 2. Helicobacter pylori infection: some patients may also be due to Helicobacter pylori breeding caused by bad breath, this situation requires the eradication of Helicobacter pylori, quadruple therapy medication, such as omeprazole, bismuth potassium citrate, clarithromycin, amoxicillin, etc., eliminating Helicobacter pylori bad breath can be improved. 3. Accumulation of food: It is possible that the patient’s recent overeating leads to accumulation of food, which causes bad breath, then the patient as long as not overeating, regular diet for a period of time after that may be improved. Halitosis may also be caused by other reasons, patients who find their bad breath and long-term without significant improvement, then need to consult a doctor in a timely manner, under the guidance of the doctor to improve the relevant examination, and targeted treatment. Another tip, if you need to use drugs should be used under the guidance of a doctor, do not blindly use drugs.