How can you tell if you have bad breath?

bad breath
? asked:

Hey, i brush my teeth and floss and eat mints and stuff, but im just wondering if there is anyway you can actually tell if you have bad breath. ive heard of a thing you can buy that will tell you, but im wondering if there is a way of telling if you do without having to buy anything expensive.
thanks for your answers!
um..
without having to blow your breath in someones face.

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