Thank you all.

I tried changing the humidity and no change.

Now I wear a chin strap with full face mask again and no more dry mouth. My tongue no longer feels like sand paper in the morning.

I'm a mouth breather and used to use the dreamwear nasal mask with chin strap. It was a pain to use the strap and the nasal mask so I switched to a full face mask, the resmed f20. I find I get good sealing with full face mask but I get a very dry mouth. Isn't the a full face mask to help with this i...