Bad Breath: Common Causes and What Helps

Most persistent bad breath originates in the mouth, where bacteria break down food debris and proteins and release sulphur compounds. The back of the tongue is the single most common site. Because the source is usually bacterial accumulation, masking the smell rarely works for long — removing the source does.

Oral causes

• Coating on the back of the tongue
• Plaque and calculus, and gum disease with deeper pockets
• Untreated decay or a failing restoration trapping debris
• Food packing between teeth or under a bridge or partial
• Dry mouth, including from medication or mouth breathing
• Dentures that are not cleaned thoroughly — see denture care
• An infection or abscess, which often gives a distinctly foul taste

Non-oral causes worth considering

• Sinus, tonsil, or throat conditions, including tonsil stones
• Reflux
• Smoking and alcohol
• Certain foods, which pass through the bloodstream and lungs
• Low-carbohydrate or fasting states producing a ketone smell
• Uncontrolled diabetes, and some liver or kidney conditions — these need medical assessment

What actually helps

1. Thorough twice-daily brushing plus daily cleaning between the teeth
2. Gently cleaning the back of the tongue with a brush or scraper
3. Staying hydrated, and stimulating saliva with sugar-free gum
4. Reducing tobacco and alcohol
5. Cleaning dentures and appliances properly, and leaving them out overnight
6. Professional cleaning to remove what home care cannot reach
7. Treating any decay, gum disease, or failing restoration found

What tends not to work

Mints and strongly flavored rinses mask odor for minutes. Alcohol-heavy rinses can worsen dryness, and long-term reliance on any antimicrobial rinse should be a professional decision rather than a habit. Brushing harder does not help and can damage gums and enamel.

When to have it examined

• Bad breath persisting despite good home care for a few weeks
• A bad taste, gum bleeding, swelling, or a gum bump
• Loose teeth or receding gums
• Constant dry mouth
• An ulcer or patch that has not healed in about two weeks

Next step

An examination can identify whether the cause is dental and treat it directly. Request an appointment or call the Florence dental service. See also cleanings and exams and dry mouth.