how to stop bad breath

How can I prevent bad breath or bad taste in my mouth when I wake in the morning?
When I wake in the morning, I always seems to have a bad taste in the mouth. I think it's because I sleep with my mouth open. How can I force myself to stay mouth closed? o How can I avoid the bad taste / breath? I brush my teeth in the morning and evening. I fill the night. I tried Listerine and it seems to help add something, but not enough.
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