i've been using this stuff called
"oral pleasure" by gary null, and despite it's tongue-in-cheek name

, it works really well. it's food grade h2o2 with some essential oils and xylitol, and i highly recommend it. i even use it on dd, i dip a qtip in it and "paint" the teeth that are showing signs of decay, and i really think it's working. it's cherry flavored, and it tastes pretty good. it's quite satisfying to see it foaming up around my gumline, too, like it know that it's working.
we also use MI paste to remineralize teeth. i bought that off of ebay.
good luck to you!