Cracks in enamel appear to stop at the dentin-enamel junction (DEJ). A, Low-magnification view of cracks in enamel. B, Indentation-generated cracks stop near or at the scalloped DEJ (orange). C, Large scallops in molars. D, Smaller scallops in anterior teeth. E, Crystals of the enamel are nearly in contact with dentin crystals at the DEJ forming an optically thin but functionally wide union. (A, C-E