There is no fastest way to treat bad breath, you need to understand the causes of bad breath and then symptomatic treatment, bad breath may be caused by dental caries, gastritis, gingivitis and other diseases, need to be treated locally in a timely manner, medication. 1. dental caries, clinical caries, if the caries is not serious, can be filled, remove the caries residues can effectively relieve bad breath symptoms. 2. Gastritis, some patients with bad breath may be related to gastritis, you can use domperidone, mosapride and other drugs under the guidance of a doctor to promote gastrointestinal peristalsis, relieve bad breath caused by gastritis. 3. gingivitis, periodontitis, clinically gingivitis, periodontitis, due to inflammation of the gum area by the stimulation, may lead to inflammatory secretion exudation, bad breath symptoms, can be periodontal treatment and under the guidance of the doctor to use amoxicillin, metronidazole and other drugs. Usually need to pay more attention to observe the individual body symptoms, if there is a disease need to be treated in a timely manner.