At least according to what my dentist says, if the bacteria in your mouth can break it down and metabolize it, it's not a good thing to have in your mouth for long periods. It looks like they can break down maltodextrins.
Here's an abstract, garnered from a quick Google search:
http://www.jodjournal.com/article/S0...034-3/abstract

Guess it's time to add a quick teeth-brushing to the post-ride routine...