[header] How to control bad breath [title] Sniff your own breath. [step] It is difficult for you to assess your own breath because you become habituated to it. This is similar to how people can have body odor and not know it. 
However, if your breath is very bad, this may work : [substeps] Cup your hands over your nose and mouth. Breathe into your hands from your mouth and inhale through your nose.