Bad breath happens to everyone occasionally. But when it persists despite brushing, flossing and normal oral hygiene, it may be worth looking more closely at what is happening in the mouth.
What can cause persistent bad breath?
Many cases begin with bacteria and food debris around the teeth, tongue or gums. Other possible contributors include gum disease, tooth decay, dry mouth, smoking, certain foods and some medicines. Occasionally, persistent bad breath can have a cause outside the mouth, which is why an assessment can be useful when the problem does not settle.
Plaque and gum health
Plaque that remains around the gumline can irritate the gums and contribute to unpleasant odour. Bleeding, swelling or tenderness around the gums are additional reasons to arrange a dental assessment.
Dry mouth
Saliva helps cleanse the mouth. When the mouth is unusually dry, odour-producing bacteria may become more noticeable. Hydration, medicines and underlying health factors can all influence dry mouth.
What you can do
- Brush thoroughly twice a day with fluoride toothpaste.
- Clean between the teeth daily using floss or another suitable interdental aid.
- Gently clean the tongue.
- Drink enough water and address persistent dry mouth with professional advice.
- Keep up with appropriate dental examinations and professional cleaning.
When should you see a dentist?
If bad breath persists despite good oral hygiene, or if it comes with bleeding gums, pain, swelling, loose teeth or another dental concern, a dental examination can help identify whether there is an oral cause that needs treatment.
Concerned about persistent bad breath?
We can assess your teeth and gums and discuss whether professional cleaning or another treatment may be appropriate.



