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If your bad breath is not a sign of poor oral hygiene or gum disease, it may signal a medical condition. Common ailments include respiratory tract infections, sinusitis, bronchitis and diabetes. Bad breath may also be a warning sign of liver or kidney problems.
American Dental Association answeredBad breath may be the sign of a medical disorder, such as a local infection in the respiratory tract (nose throat, windpipe, lungs), chronic sinusitis, postnasal drip, chronic bronchitis, diabetes, gastrointestinal disturbance, liver or kidney ailment. If your dentist determines that your mouth is healthy, you may be referred to your family doctor or a specialist to determine the cause of bad breath.