Halitosis is categorized into halitosis of oral origin and halitosis other than oral origin, which need to be targeted to take measures to solve the problem through effective brushing and treatment of oral diseases and multidisciplinary cooperation. 1. Halitosis of oral origin: thoroughly remove plaque and tartar in the oral cavity, and learn to control plaque, effective brushing, especially pay attention to cleaning the back of the tongue, filling caries, repairing poor restorations, reasonable use of flossing, reasonable maintenance and cleaning of the restorations. Appropriate use of chlorhexidine rinse. 2. Non-oral bad breath: for reasons other than oral such as chronic bronchitis, esophagitis, need to be multidisciplinary cooperation with internal medicine, otolaryngologist and referral, can take bromhexine under the guidance of the physician to treat bronchitis, omeprazole treatment of esophagitis. Halitosis not only affects one’s quality of life, but also has a certain psychological impact, it is recommended to go to the hospital for examination and treatment, and the use of drugs need to follow the doctor’s instructions.