Breath that smells after brushing can come from bacteria on the tongue, gum disease, dry mouth, or tonsil stones. Clean your tongue, floss, and see a dentist.
Common causes
- Bacteria on the tongue.
- Gum disease.
- Dry mouth.
- Cavities.
- Food in teeth.
- Sinus infection.
- GERD.
- Tonsil stones.
Fix
- Brush or scrape your tongue.
- Floss.
- Use mouthwash.
- Hydrate.
See a dentist
If bad breath persists.
Fact
About 80% of bad breath starts in the mouth.
Hidden sources
Bad breath right after brushing usually comes from places a brush misses: the back of the tongue, between teeth, under the gumline, tonsil crypts or dentures. Bacteria produce volatile sulfur compounds within minutes of cleaning. The tongue’s surface area is large, and its coating holds a large share of odor-producing bacteria.
- Tonsil stones (tonsilloliths) form in tonsil pits in about 10 percent of people and smell strongly.
- Gum disease pockets deeper than 3 mm trap bacteria.
- Reflux, sinus drainage and certain foods such as garlic cause odor from deeper in the body.
- Dry mouth lowers natural cleansing.
Fix
Scrape or brush the tongue gently, floss, and rinse with water or an alcohol-free mouthwash with cetylpyridinium chloride or zinc. Replace the toothbrush every 3 months. Stay hydrated and treat nasal congestion. A dentist can find cavities, gum disease and cracked fillings. If a dentist finds no cause, see a doctor about reflux, sinus infection, diabetes, kidney or liver issues.
Hidden sources
Smell after brushing may come from the tongue, tonsil stones, gum disease, cavities, postnasal drip, reflux or dry mouth. Brushing alone does not clean between teeth.
Fix
Floss daily, clean the tongue, hydrate and see a dentist for a check. Persistent odor may need a medical review.
Persistent causes
Bad breath after brushing may result from tongue coating (the main source in 60 percent of cases), tonsil stones, gum pockets, dry mouth, mouth breathing, sinus infections, reflux or diabetes. Bacteria produce volatile sulfur compounds within minutes of brushing if the tongue is not cleaned.
Targeted cleaning
Use a tongue scraper daily, floss, replace the toothbrush every 3 months, clean dentures and use a zinc or CPC mouthwash. Treat tonsil stones by gargling. Visit the dentist for periodontal evaluation. If odor smells fruity (ketones) or like ammonia (kidney) a medical evaluation is needed.
Based on data from the American Dental Association and the Cleveland Clinic
