yeah. It is.
I'm now testing it using standard brush and powder with xylitol.
Seems to be working fairly well but it's too soon to judge. (And not solving your issue)
Discussion
xylitol, mannitol and lactose all are inhibitors of many common tooth bacterial species, they call them "non-fermentable sugars" and all three can sometimes be found in especially apple ciders, for this reason, as the sugars in apple juice are very fermentable (and the skin of the apple is usually covered in yeasts that do it)