well, there is a whole periodic table and the balance of all that in the body, from lack of necessary minerals to poisoning by unnecessary ones. phosphorus, calcium, strontium - it sounds like you know the drill.
how did you use MHs tooth powder and for how long?
remember the basics like hydration and circulation. my teeth still crumble from dentist and fluoride damage. the thing that works best for me is leaving them alone and flossing a lot to keep the gums healthy. i brush with baking soda and the occasional borax.