every morning my bf says my breath smells like "bum" (lol) so i breath in my hand to smell it and i smell nothing. when i DO think about it i wonder if people i talk to though out the day notice how gross it might be!

i brush my teeth and stuff so whats the problem? my mom says "pew, your breath smells like rubber"

and i do it again, breath into hand and nothing! bed time, i brush my teeth, floss once in a while and mouthwash some times, get into bed and "pew, honey, your breath smells like mint and 'bum'!"
i dont know what it is and its starting to bug me tho i dont think about it much
help???