Carious dentinal lesions in which a remineralized surface layer covers the decalcified region were subjected to electron-probe and electron microscope studies. The remineralized surface layer contained especially high concentrations of F and K and was composed of crystals which were much larger than the crystals in intact dentine. In the decalcified regions there was a reduction in the concentration of Ca, P, and Mg. The decrease in Mg content seemed to start earlier than that for Ca and P. Although not as prominent as in the remineralized surface layer, crystals in the decalcified region were larger than crystals in intact dentine.
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