Biotene doesn't do anything for me but dry me out even worse, I use ACT that seems to help a little bit you can't drink anything for a half hour after you use it. That way it get's to go deeper into the blood vessels instead of being washed out when you do your final rinse

I actually prefer cold pressed sesame oil (NOT the toasted sesame oil you use in Chinese food). Coconut oil definitely works well, though! I like to mix essential oils into oil sometimes. Myrrh is what I use most often, the taste is unfortunate, kind of like latex gloves, but it makes my mouth feel really clean.

I intermittently have problems with dry mouth. I use Biotene dry mouth rinse (Target has a generic that works just as well but is much cheaper) to really good effect.

Have you tried oil pulling? Some people find it helps a lot with dry mouth.

I have the very same isuue. It is just awful and I hate it as much or more than you. My dentist gave me thin pliable plastic trays, I had to get them molded to fit my teeth, and fluoride that I'm supposed to use for 15 minutes a day. Sadly, I am always too exhausted to do it. But ask your dentist about it. I did have a couple visits with nothing wrong!

I have a water bottle by my side 24/7 and I sip all day to keep my mout moist.