The obvious problems are food choices.. But genetics can also play a key role along with what is eaten during pregnancy.. There are some studies out there that suggest flouride (which was found from Agent Orange) causes more tooth decay than it prevents. Many cases of kids not having cavaties, getting a flouride treatment and then having cavaties with no change in diet. I'm learning this one the hard way. :) A natural ways to heal teeth is magnesium-baths in Epsom salt, or just magnesium bath salts. Coconut oil and oil pulling helps. There are other ways than filling your mouth with amalgam and mercury.