I don't have peridontal disease; but have trained myself to be a nose breather to use the Swift II nasal pillows.
As a result, I no longer mouth breathe, but have to use an upper retainer because I NOW thrust my tongue against the back of my front teeth and have pushed them out a bit and caused gaps between my front teeth.
My lower front teeth have also been pushed out and have gaps - to the degree that I now have a bit of a lisp, which I did not have before.
I am going to an orthodontist for braces, then a bite guard to keep my newly aligned teeth from being pushed out again!
What a pain - seems like OSA problems can snowball - constant vigil to make sure things are taken care of...
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From the land of ahhhzzzz...