Bad Breath...

I have to use a mouth guard at night to avoid grinding my teeth. I rinse it and soak it in mouth wash every day. When I wake up I brush my teeth, floss, and use mouth wash. Even scrape my tounge. Doesn't seem to do anything. By halfway through the day it's horrible. What else can I do? Do you think it;s because using the mouth guard at might I have my mouth open the whole night?
Bad Breath...
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