Dry Mouth w/ Humidifier & Bulging Cheeks

[Richm]

As a newbie, I would appreciate any help. First I used a ResMed Ultra Mirage, but the flimsy chin strap did not prevent dry mouth- even with a humidifier - and I would awaken and remove it during the night. Next, I bought a Respironics Comfortfull Full Face Mask (medium). It caused my cheeks to bulge like that of a chipmunk's. My doc said not to worry. Just crank-up the humidifier temp and the warm air entering my mouth would prevent dryness. It did not. I still woke-up and removed it. I don't know if the fit has anything to do with this. My doc said it fits okay, but I weigh 125 lbs. (57 kilos), and have a small face. My equipment is a REMstar/Plus. Thanks.