There is no best way to treat bad breath, but the cause should be taken into account. Halitosis is mainly caused by oral diseases, digestive diseases and eating heavy food. There are many ways to treat it, including general treatment, medication and surgery. 1. Oral diseases: gingivitis, periodontitis and dental caries can cause bad breath. Gingivitis and periodontitis can be treated with scaling and scraping to effectively remove calculus, and minocycline can be used locally in periodontal pockets to eliminate inflammation. If it is caused by dental caries, you can choose resin filling repair. 2. Digestive diseases: Digestive dysfunction, dyspepsia will occur, so it will produce bad breath, at this time you should improve the intestinal bifidobacteria, you can choose soybean oligosaccharide, oligofructose. If it is caused by anaerobic infection, you can take tinidazole, metronidazole. 3. Eat heavy food: garlic, onions and other foods can lead to the appearance of obvious bad breath phenomenon, at this time you can focus on the oral cavity cleaning, generally do not need to take special treatment. Halitosis is caused by a variety of reasons, if the disease is caused by factors, should receive timely treatment, the use of drugs need to follow the doctor’s instructions.