My mother developed dry mouth (not related to Sjogrens) which may have been induced from st. Johns wort. We have tried multiple natural remedies which did not work. Baking soda helped a little but did not solve the problem. I learned about Lactoferrin from Colostrum and Whey protein and how it is a glycoprotein secreted by saliva (and tears). It has immune function (antimicrobial) in mucus membranes like the mouth and gastrointestinal tract. I suggested she open the capsule and put the powder in her mouth to dissolve and work through with her tongue. She grudgingly did so and used a little silver hydrosol to wet it. It helped the first time she used it and has done it another 3 or 4 times since (once per day). She very happily reported it has helped tremendously.
I did some internet searches and had not come across anyone doing this. Earth Clinic is a great website for sharing and I hope this helps someone else. The dry mouth was incredibly irritating for her.