I would prefer this to be answered by a bio-chemist or chemist as I am interested in the Chemistry not the biology.
Firstly what are teeth made from? (plz refrain from saing 'calcium' and 'collagen', I dont know about you, bu My teeth are niether silver or slightly more reactive than magnesium).
Secondly Im pretty sure that tooth decay is due to the acidic output of bacterium living on the sugar in your mouth. If so what are these bacterium and is it lactic acid they produce?