u/Bleareyedbanality

I clench so hard at night I broke a molar. It’s not the first one unfortunately. I have some pretty good stress lines in my other teeth.
I have sleep apnea and wear a mask- when I wear a mask and a mouthguard it makes me gag and absolutely can’t wear the mouth guard.
Is there any other solutions for me?

If I have a Miele c3 complete powerline what do I need to get a powered brush head?

If I make a Plaster face cast can I use it to form
Hot/warm thermoplastic splinting material? Or is not durable or hard enough?