It's the flouride that causes those white spots. The body only needs a small amount of flouride and if you live in an area that puts flouride in the water, you will get too much. My child has them on her teeth (we didn't have flouride in our water at the time and my pediatrician had me give her flouride supplements! Another thing that I did while trusting a Dr) I have also stopped using toothpaste that contains flouride and have a filter on my sink that takes out the flouride. I have a lot less scraping from the dental hygenist since I have started using "good" toothpaste.