[wry_discontent]

I've been using NoBS toothpaste tabs for a couple years which are nano-hydroxyapatite. I find them effective. No issues at my dentist.

In fact, a year ago, they wanted to put in a filling for a minor cavity, but I wanted to put it off and by the time I went back they said it was gone.

edit: I also like the tabs because they're easy to travel with.