Sour breath, or halitosis, occurs when bacteria in your mouth break down food particles, producing foul-smelling sulfur compounds. This happens most often due to poor oral hygiene, dry mouth, or certain foods.
When you eat, tiny food particles remain in your mouth. Bacteria feed on these particles, releasing volatile sulfur compounds (VSCs) that cause bad breath. These bacteria thrive in low-oxygen environments, which is why dry mouth worsens the problem.
The most common causes of sour breath include:
Many people assume bad breath comes solely from the stomach, but 85% of cases originate in the mouth, according to the American Dental Association. While stomach issues can contribute, poor oral hygiene is the primary culprit.
To combat sour breath, maintain good oral hygiene, stay hydrated, and avoid foods that trigger bad breath. If the issue persists, consult a dentist to rule out gum disease or other underlying conditions.
For example, if you notice your breath smells worse in the morning, try drinking more water throughout the day and using a tongue scraper to remove bacteria. If you've tried these steps and still experience bad breath, see a dentist to check for gum disease or other oral health issues.