EnamelScanning electron microscope view of the surface of the enamel of a primary (baby) tooth produced with the prenatal fluoride supplement. The structures are the ends of the enamel rods - the density of the color indicates strong mineralization, and the absence of space between the rods shows an extremely tight tooth structure - both of which  explain the unusual resistance to decay that teeth possess  when produced this way - with all the essential nutrients.    The bottom picture is the surface of an ordinary primary (baby) tooth developed as required by the Dental Association and Lobby - without the required fluoride. See the soft, easy to decay, protein between the lightly mineralized enamel rods.  These teeth represent a birth defect due to a nutritional deficiency, but they are not recognized as such as they are considered normal.