A dentist treats chronic bad breath caused by gum disease, or refers a patient to a periodontist, a dental specialist in treating gum conditions, states WebMD. A dentist may refer a patient with a healthy mouth to a physician to discover the odor's source and develop a treatment plan.
Brushing the teeth twice daily, flossing once daily, and replacing the toothbrush every two or three months or after an illness are important oral hygiene habits that help minimize bad breath, called halitosis, notes WebMD. Several mouthwashes contain antiseptics that kill bad-breath-causing germs. Consult a dentist about which product to use. Conditions that can cause chronic bad breath include dry mouth, bronchitis, diabetes, and kidney and liver disorders.