Hello Onward,
I have not posted here in ages but I've been on CPAP for nearly 12 years at this point. I'M one of the lucky ones who adapted pretty easily and quickly to it. But masks are the part that is hardest to deal with.
I have tried and used only 2 models of masks in all that time. The first and the one I'm still using (I'M on my third) is the Resmed Activa LT. But I'm looking to change as it's hard to find now and I do not think it would do well for you.
https://www.resmed.com/en-us/healthcare ... activa-lt/
One of those I have tried that was super comfortable was the Philips Dreamwear (
https://www.cpap.com/productpage/pr-dre ... k-fit-pack) and I'm surprised no one has recommended you try it. It has no hard plastic, fits under the nose and is pretty loose. Hose comes out the top so not tugging at the mask at all.
I ended up not using it for two main reasons. One is that, unlike you I'm a side sleeper and I use a special ergonomic pillow that's pretty hard and keeps my head level when on my side and barely has anything but neck support when on my back. Air in the Dreamwear passes through the frame so when on my side, that side was pretty much blocked and unlike what they say, I found it impeded air flow too much and made it too noisy. I,m very sensitive to noise so that was the second reason I didn't continue with it.
But you are pretty much forced to sleep on your back so that would not be an issue for you. Mouth breathing would still need to be addressed though and that is also not a problem I have so cannot advise you there.
A similar one from Resmed is the AirFit 30i (
https://www.cpap.com/productpage/resmed ... -cpap-mask). It's constructed a bit different but also has the hose on top and would, I'm sure, fit pretty loosely as well avoiding your teeth pain issues like the Dreamwear should.
In terms of pur physical comfort, the Dreamwear was amazing really. I still have it and might try it again when I get my new CPAP (both of mine were part of the recall and I cannot wait to replace them with the new AirSense 10 I ordered last week
Good luck and don't give up just yet. The therapy made a big difference for me as I was starting to have memory loss and other troubles... and I was only in my mid 40s but I have severe apnea. SO this CPAP thing is a life saver for me.