Do people often offer you a mint? A tic-tac? You might have bad breath! Dr. Jose Blanco a general and cosmetic dentist at Images Dentistry discusses the many different causes of halitosis or bad breath, and the most common one is gum disease. Can you check yourself if you’re having bad breath? People won’t usually tell you. Dr. Blanco says: yes, you can; but the most important thing is to brush and floss your teeth to get rid of the bad-breath-causing bacteria.