SEM images of intact (a-b) and hypoplastic (c-h) teeth. Dark color corresponds to the regions with high organic content (see EDS spectrum) (d). Regular prismatic structure of enamel is clearly visible (b,d) with EDS spectra corresponding to hydroxyapatite mineral. A boundary between dark and light spots on enamel surface (e,f) is identified discriminating the mineralized region from organic-enriched area, which is characterized by newly-formed (calcite, halite) mineral deposition (g,h). Filled white circles are EDS analytical points.