I just took a look at my Biotene Oral Balance Gel. The tube I'm using says "Contains protein enzyme system..." but the two I bought after that (still in the closet) don't. They say "New improved pH balance." Which means they dropped the enzymes.

This is very disappointing. When I first started using dry mouth products I tried just about every product I could find, and only the Biotene ones worked. Some of the others actually made my mouth dryer after the initial few minutes.