I think I read something you posted a long time ago (I could be dreaming this up) that the acids in morning saliva can crack the mineral components in the 6 thus making it available for the tooth structures to re-mineralize?
The Azomite powder is apparently a vulcanic ash (a natural fertilizer). The company does not recommend eating it, but one of the Westoneprice advocates recommended it as a mineral food. Apparently its dirt cheap. I was thinking of adding it to my water.
Never heard of river rice, I'll check it out. Thanks again.