What Causes Bad Breath?

Bad breath can have many contributors, including oral hygiene, tongue coating, dry mouth, foods, tobacco and dental or periodontal problems.

The useful distinction

Persistent bad breath deserves attention to the cause. Masking odor or taking a supplement is not a diagnosis.

Where to go next

Continue with our guide to dry mouth and bad breath.

Last reviewed: September 2026. Merchant details and health evidence can change; verify time-sensitive information before acting.