Last updated: November 2026
It’s hard to smell your own breath, because your nose gets used to it. Here are five easy ways to check, why breath can smell bad (including from your throat and first thing in the morning), and what actually fixes it.
5 easy ways to tell if you have bad breath
- The wrist test: lick the inside of your wrist, wait 10 seconds, then smell it.
- The floss test: floss between your back teeth and smell the floss.
- The tongue scrape test: gently scrape the back of your tongue with a spoon and smell it. A white or yellow coating often means odor-causing bacteria.
- Ask someone you trust. It’s the most reliable test.
- Ask your dentist at your next cleaning.
Cupping your hands and breathing into them usually doesn’t work well, because you mostly smell your hands.
What causes bad breath?
- Bacteria on the tongue and between teeth: the most common cause by far. They produce smelly sulfur compounds.
- Gum disease: persistent bad breath can be an early sign.
- Dry mouth: saliva washes bacteria away, so anything that dries your mouth makes breath worse, including mouth breathing, some medications, alcohol and dehydration.
- Food and drink: garlic, onions, coffee and alcohol.
- Smoking and tobacco.
Bad breath after sleeping (morning breath)
Saliva flow drops sharply while you sleep, so bacteria multiply overnight. That’s why almost everyone has some morning breath. Brushing your teeth and tongue, drinking water, and eating breakfast usually clear it up. If you breathe through your mouth or snore, it may be worse.
Bad breath from the throat
Sometimes the smell comes from further back: tonsil stones (small, foul-smelling deposits in the tonsils), postnasal drip from allergies or sinus infections, or acid reflux. If your teeth and tongue are clean and the smell persists, see a dentist or doctor.
How to get rid of bad breath
- Brush twice a day for two minutes, and clean your tongue with a scraper or your brush.
- Floss or use interdental brushes daily.
- Drink water through the day and chew sugar-free gum to boost saliva.
- Replace your toothbrush every 3 to 4 months.
- Get regular dental cleanings to remove plaque and tartar.
- Quit tobacco.
When to see a dentist or doctor
If bad breath lasts despite good brushing, flossing and tongue cleaning, see your dentist to check for gum disease or cavities. If your mouth is healthy, a doctor can look for sinus, tonsil, reflux or other causes.
FAQ
How can I tell if my breath stinks without asking?
Try the wrist or floss test, or gently scrape the back of your tongue and smell it.
Why does my breath smell even after brushing?
Common reasons are bacteria on the tongue, gum disease, dry mouth, tonsil stones or postnasal drip.
Does mouthwash cure bad breath?
It masks odor for a while. Cleaning your tongue and between your teeth deals with the cause.
Related reading
Sources: American Dental Association (MouthHealthy) guidance on halitosis.
Health note: This article is for general information and isn’t medical advice. Talk to your doctor about symptoms that are new, severe or getting worse.
