My breath is really bad, what do I do?

bad breath
-=Me=- asked:

I brush my teeth two times a day, but even though, whenever my mouth is dry, I have a really bad breath. that’s mostly during school hours, because I never eat/drink there. When my mouth is not dry, it’s still bad, but not as much. So.. What can I do?
XD I know, Bubbly. In fact, at school we use shared desks, and I sit next to a girl. I hate talking to her because of my breath.

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