Of course, the most objective way to find out would be to ask someone close to you. If these checks yield unpleasant results, you may be tempted to try breath freshening products. At best, mouthwash, tooth paste, breath mints, and baking soda are just bad breath band-aids and many products actually make the problem worse. If you are worried about your breath, rather than suffer in silence, consult a dentist. Although halitosis can usually be controlled by treatments limited to the mouth, sometimes bad breath is a signal of a more significant health problem.
Professional diagnosis can help determine the cause and appropriate treatment.