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Why do poor habits cause bad breath?

Dentist, WebMD Medical Expert
American Dental Association

If you don't brush and floss your teeth daily, food particles can remain in your mouth, which promotes bacterial growth between teeth, around the gums, and on the tongue. This causes bad breath. Antibacterial mouth rinses can also help reduce bacteria. In addition, odor-causing bacteria and food particles can cause bad breath if dentures are not properly cleaned.

Smoking or chewing tobacco-based products can also cause bad breath, stain teeth, reduce your ability to taste foods, and irritate the gums.

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