One way to check if you have bad breath is to cover your mouth and nose with your hands, exhale and "feel" your breath. Another way to do is ask someone you trust if you have good or bad breath. Remember that many people have a strong breath upon awakening, the result of a reduced saliva flow during sleep that allows acids and other debris ferment food in the mouth. A brushing and cleaning careful with the floss before going to bed and brushing teeth and tongue from the lift to help eliminate bad breath in the morning.