The idea that you can remineralize your tooth enamel is not a fanciful claim.
Teeth naturally demineralize and remineralize.
So far no results of clinical trials on healthy people have been published. In a small study where decay-promoting gels were applied to teeth, Enamelon reduced cavities more effectively than Colgate Total. Enamelon is safe for children, but as with all fluoridated pastes, parents should supervise small children, making sure they don't swallow the paste or use too much of it. A remineralizing paste could be helpful for those at high risk for cavities or with sensitive teeth. Enamelon costs a little more than regular toothpaste.