Bad breath? Check your tongue before your stomach
Do You Know? For patients.
Most people blame the stomach for bad breath. In fact, in about 9 out of 10 people the smell starts in the mouth itself, and the main source is often the back of the tongue, not the teeth.
What the research shows
Bad breath comes mainly from sulphur gases made by bacteria that break down proteins from food, saliva and dead cells.
The white or grey coating on the back of the tongue is the main source of these gases in most people.
Gum disease is the second big source: the same bacteria that cause bleeding gums also produce the smell.
A dry mouth, from mouth breathing, fasting, some medicines or not drinking enough water, makes the smell stronger.
Why your dentist cares
Bleeding gums, deep pockets, old leaking fillings and food trapped under bridges or dentures can all keep bad breath going.
Dentures worn at night and not cleaned well are a common, hidden cause.
When the mouth is healthy and the smell continues, it is worth checking the tonsils, sinuses, stomach and blood sugar with your doctor.
What to do
Clean your tongue gently every day with a tongue scraper, from back to front.
Brush twice daily and clean between your teeth with floss or small brushes.
Drink water through the day and take out and clean dentures every night.
Mints and mouthwash only hide the smell for a short time. If it keeps coming back, book a dental check-up and a professional cleaning.
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This article is general information and not a substitute for an examination.
References
De Geest S, Laleman I, Teughels W, Dekeyser C, Quirynen M. Periodontal diseases as a source of halitosis: a review of the evidence and treatment approaches for dentists and dental hygienists. Periodontol 2000. 2016;71(1):213-227. doi:10.1111/prd.12111
Seerangaiyan K, Jüch F, Winkel EG. Tongue coating: its characteristics and role in intra-oral halitosis and general health, a review. J Breath Res. 2018;12(3):034001. doi:10.1088/1752-7163/aaa3a1
Marinis K, Kanellos G, Papaioannou W. The oral cavity as a bioreactor in halitosis. J Breath Res. 2026;20(3). doi:10.1088/1752-7163/ae9b39
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