Over 90 million North Americans have halitosis - or "bad breath." According to Dr. Harold Katz - founder of the California Breath Clinic - bad breath has nothing to do with your still have bad breath after changing your eating habits, it could mean something more serious. In fact, 10 percent of bad breath cases are a symptom of a chronic sinus or respiratory infections, or acid reflux disease, as well as a liver or kidney disorder, cancer, or diabetes. So, if your breath's still stinky, talk to your doctor.