The Real Reason Your Breath Smells Bad—and When It’s Not Your Mouth

Bad breath, also known as halitosis, is a common problem that affects millions of people. While many people assume the cause is poor oral hygiene, persistent bad breath can sometimes signal a deeper issue. Understanding the source is the first step toward finding an effective solution. The Most Common Cause of Bad Breath In many cases, bad breath begins in the mouth. Bacteria naturally accumulate on the teeth, gums, and tongue throughout the day. When these bacteria break down food particles, they release sulfur compounds that create unpleasant odors. Poor brushing and flossing habits can allow bacteria to thrive, making regular