Extreme dryness

About 2 months ago I switched from a Quattro to the ResMed Liberty Hybrid. For the most part I've been happy with the change, but over the last couple of weeks I've begun having a terrible problem with dryness, to the point where it's painful to move my mouth or tongue and that pain wakes me up. Other than the mask I've made no changes. Well, I've turned up the setting on my humidifier a bit trying to help with this problem, but that made no difference. The humidifier heater is working fine; I'm actually going through more water now than I ever have. I'm at a loss as to why this is happening. Any thoughts?

I have the mouth dryness problem, too--on occasion--especially when my mouth falls open at night.
I really like using PBF mouthwash before bedtime; and sometimes chew a piece of the dry mouth gum before hose time.
I also keep water handy in case I need to take a swig at night, or first thing in the morning.
I have had fewer problems since I started drinking more water in the daytime--64 ounces minimum. (2 liters)

KSMike wrote:... over the last couple of weeks I've begun having a terrible problem with dryness, to the point where it's painful to move my mouth or tongue and that pain wakes me up.

I wonder if this might have more to do with dryness in your home than in your mask. Heating season has begun with a vengeance for us northern-hemisphere folks. The humidity in my home dropped like a rock as soon as the furnace started running, and I was experiencing the same thing as you are.

I found that no amount of pushing up the humidity on my machine could counteract the dryness all around me. I set up an inexpensive ultrasonic humidifier in my bedroom and another in the living room, and the problem went away. Might be worth a try!

I appreciate your replies! I do need to drink more water, however I don't think I'm drinking any less than I ever have. As to household humidity, this is the first winter on a new HVAC system and new whole-house humidifier. I've noticed that the humidifier doesn't seem able to get the house humidity over about 27-29% which is a little drier than I like - but not that much. However, what I'm trying to figure out here is what is different all of a sudden - so maybe that's it.

I can't remember the brand name right now (OSA? old age? who knows! ) but there are products made for people who have chronic dry mouth. I believe that includes a moisturizing mouth wash. I'm sure your pharmacy could help you find these products. Biotene, maybe? That might be it. . .
Anyway, good luck finding something that works for you.