What causes bad breath and how do you get rid of it for good?
Most persistent bad breath (around 80–90% of cases) starts in the mouth. The usual culprits are the bacterial coating on the back of the tongue, gum disease and food trapped between the teeth. That is why the fix is rarely mouthwash; it is tongue cleaning, cleaning between the teeth and, where needed, a professional clean and gum treatment.
What causes bad breath?
Bacteria in the mouth break down food debris, shed cells and proteins in gum pockets, releasing volatile sulphur compounds. These gases are the main source of the smell. Bacteria thrive on the back of the tongue, between the teeth, in deepened gum pockets and in decayed cavities.
| Cause | How to spot it |
|---|---|
| Coating on the tongue | White-yellow layer on the back of the tongue |
| Gum inflammation and gum disease | Bleeding when brushing, swelling, receding gums |
| Decay, broken fillings or crown margins | Food trapping, smell from one area |
| Dry mouth | Drinking too little, mouth breathing, some medicines (antidepressants, blood pressure and allergy drugs) |
| Uncleaned dentures or aligners | Smell is stronger when the appliance is removed |
| Food, drink and smoking | Garlic, onion, coffee, alcohol; temporary smell |
What causes bad breath outside the mouth?
Less often, bad breath comes from elsewhere. Tonsil stones and chronic tonsillitis, sinusitis and post-nasal drip, and acid reflux are the most common. Uncontrolled diabetes can give the breath an acetone-like smell, and kidney or liver disease can cause other distinctive odours.
If the dental examination finds no cause in the mouth, we refer you to an ear, nose and throat specialist or your GP.
How can I tell if my breath smells?
We get used to our own breath, so it is hard to notice. These simple checks give you an idea:
- Lick your wrist, let it dry for a few seconds and smell it.
- Smell a piece of floss after passing it between your back teeth.
- Gently scrape the back of your tongue with a spoon and smell it.
- Ask someone you trust.
What can you do at home?
- Brush twice a day for two minutes with fluoride toothpaste. Here is the right technique.
- Scrape your tongue from back to front a few times with a tongue cleaner; this usually makes the quickest difference.
- Clean between your teeth once a day with floss or interdental brushes.
- Drink enough water; sugar-free gum increases saliva flow.
- Take out removable dentures or aligners at night and clean them daily.
- Stopping smoking reduces both the smell and the risk of gum disease.
Do mouthwash and mints help?
Mints and scented mouthwashes only mask the smell for a short time. Alcohol-free mouthwashes containing cetylpyridinium chloride (CPC) or zinc can help by lowering the bacterial load. Chlorhexidine mouthwash is effective, but long-term use can stain teeth and change taste, so use it briefly and only on your dentist's advice.
What happens at the dental examination?
We check the teeth, tongue, gums and any appliances, measure gum pockets and take X-rays if needed. Treatment depends on the source:
- Professional cleaning and polishing
- Deep cleaning and gum treatment for gum disease
- Treating decay and replacing old fillings or crowns with leaking margins
- Treating inflammation around a partly erupted wisdom tooth, or removing it if needed
Dent32 in Beylikdüzü sees patients seven days a week. If bad breath has lasted several weeks, book an examination.
Frequently asked questions
Is morning breath normal?
Yes. Saliva flow drops at night, so everyone has some morning breath. It goes after breakfast and brushing.
Does bad breath come from the stomach?
Rarely. Reflux can contribute, but most persistent bad breath starts in the mouth. A dental examination is the best first step.
Will a professional clean get rid of bad breath?
If the smell comes from tartar and gum inflammation, it helps a great deal. For a lasting result you also need tongue cleaning and cleaning between the teeth at home.
Why do children get bad breath?
Mouth breathing, enlarged adenoids or tonsils, decayed teeth and poor brushing are the most common causes. A dental check and, if needed, a paediatric ENT review are recommended.
