Somewhat related, I used ACT dry mouth lozenges, with Xylitol, a few times. Once I did just before seeing the doctor, and got called in, so I wanted to take it out, and not wanting to waste it, I just put it in my water bottle, which slowly dissolved it, turning it light blue. I sipped on it the rest of the day, and it kept my mouth moist, fresher much longer than anything.
