It can be caused by poor oral hygiene, strong-smelling foods and dental-health problems. Chronic bad breath usually results from bacteria on the tongue and mouth surfaces, releasing unpleasant odours. Short-term bad breath is associated with strong-smelling foods and drinks, e.g., fish, onions, garlic and coffee.

What do you do when someones breath stinks?

What You Can Do About Bad BreathBrush and floss more often. Rinse your mouth out. Scrape your tongue. Avoid foods that sour your breath. Kick the tobacco habit. Skip after-dinner mints and chew gum instead. Keep your gums healthy. Moisten your mouth.More items •Mar 22, 2015

Do cavities smell like death?

Breath that smells rotten or fetid (like garbage or death) The odors from old food and bacterial growth may smell like decay. Likewise, poor dental health can lead to: cavities. ulcers.