There is no cure for bad breath fastest medicine, for bad breath patients, need to clarify the cause of the disease, according to the cause of the relevant drugs for treatment. 1. Halitosis can be caused by physiological factors and pathological factors, physiological factors include not paying attention to oral hygiene, eating too much spicy and stimulating food, etc., for physiological phenomena usually do not need medication, it is recommended that the patient daily to develop healthy habits, morning and evening brushing, diet to light, but also can use dental floss to clean the gap between the teeth. 2. Pathological factors causing bad breath include oral diseases (periodontal abscess, oral ulcers, etc.), intestinal diseases (peptic ulcer, chronic gastritis, etc.), nasopharyngeal diseases (sinusitis, atrophic rhinitis, etc.), etc., and different drugs are given according to different diseases. 3. In case of periodontal abscess, iodized glycerin, chlorhexidine solution and other medications are generally preferred for treatment. In the case of mouth ulcers, drugs such as lidocaine gel and chlorhexidine gargle are preferred. 4. If the bad breath is caused by peptic ulcer, chronic gastritis, you can use levofloxacin, furazolidone, clarithromycin, metronidazole and other drugs for treatment. 5. If bad breath is caused by sinusitis, it can be treated with drugs such as tinidazole, metronidazole, and intranasal decongestants. If the bad breath is caused by atrophic rhinitis, you can take cod liver oil, compound estradiol nasal drops and other drugs for treatment. Halitosis patients if discharged physiological factors, should be timely to the hospital, identify the cause of the symptomatic treatment, the use of drugs need to comply with medical advice.