There are many causes of bad breath, such as dental caries, periodontal disease, etc. If you want to get well quickly, the most scientific and effective way is to go to a regular hospital to clarify the cause of the disease, and then carry out filling surgery, periodontal scaling and other treatments. 1. Dental caries: carious cavities are prone to residual food debris, which can produce a foul odor through bacterial fermentation and decomposition. This kind of bad breath is not effective to take medicine, you need to remove the decayed tissue, and then resin filling. 2. Periodontal disease: Periodontal bacterial decomposition produces hydrogen sulfide, indole and ammonia gas, which can be manifested as bad breath. This cause of bad breath, need to carry out periodontal treatment, at the same time you can take oral metronidazole, amoxicillin and other drugs, the choice of specific drugs, need to specialists according to the clinical situation of comprehensive judgment. 3. poor oral hygiene: this is generally physiological bad breath, such as eating certain stimulating foods, such as onions and garlic, etc., this situation does not need to take medication, timely cleaning of the oral cavity can be improved. Halitosis is obvious, can actively go to the hospital, clear cause for targeted treatment.