It doesn't cure the dry mouth but once my mouth had healed enough to tolerate it, I found that sparkling water was really refreshing and made my mouth feel fresh and moist for longer than plain water. The Biotene products help with comfort as well. Also, a humidifier next to the bed at night has reduced the number of times I wake up to drink water.
I didn't see much improvement with Salagen but I know it has helped some people. My swallowing therapist also suggested acupuncture but my saliva has been returning on it's own lately so I haven't needed to try it. Hopefully with a little more time, Kevin's saliva will come back, too.