Herbsman
Hi,
I think there are many tooth powders, vicco vajradanti is one you can find on ebay, dr christopher has one you can find it, i think on this forum made by MH Herbalist.
You could also make your own, there must be recipe,s on the net, i think its no problem to use with mercury fillings but not quite sure.
In any case you should read up on how to prevent cavities by using certain foods/minerals etc, ramiel nagel wrote a book on it mainly look for organic vitamins a,d,e,k maybe some boron and the right fats, omega 3 etc.
Propably best to ditch your usual toothpastes since it contains glycerine, and maybe get some real cheese or raw milk.
And a waterpik helps.
bye,