Did you know that your fingernails can tell you if you have heavy metals? If you have no “moon” in the nail bed. I DON’T EXCEPT ON THUMBS! Lead makes the nails turn white. Lack of Zinc causes ridges. I am going to ask for a chelation test or maybe order one online. If I have mercury, there is nothing I can do except replace all my crowns. But first find a dentist who knows the new materials. Do you have any advice?