For over a year I have foamy slimy saliva in my mouth my tongue is now drying and my lips get dry but it's constant in the morning I do have to spit and it's foamy and white. I have been to a GP tests done stomach and xrays of throat went to allergist ENT. I have changed my diet and my water intake is good. It's getting worse and so annoying. I don't cough I don't have nausea I just have constant foamy slimy gunk in mouth. Recently started tasting sour. I also was at my denist, I sometimes feel my mouth is dry he says it's not. The start of this slime was after a root canal 2 years ago in time I sometimes had a sticky film on my lips and this is what it has turned into and need some suggestions to fet back to normal. I can scrape my tongue a couple days a week and it removes the film off.