How do you cure having a dry mouth 24/7?

I’ve been drinking water, chewing gum, eating food, etc, but nothing is helping with my dry mouth. I’m beginning to think it’s a more serious condition since it’s been going on with me for two months now. The winter time makes me very dry for both my skin and body in general. I was hoping I’d find an easier fix to help get rid of the dryness instead of traveling to the doctors.