Abstract
Published work is cited to indicate that there is a post-eruptive increment of organic material in tooth enamel. This is most apparent at the sites of initial caries that provide optimal conditions for protein adsorption by the apatite of dental enamel. Lipids, polysaccharides or other salivary, bacterial or food constituents may also be deposited in enamel defects to form organic complexes of unknown sorts. This acquisition of organic material is believed to modify the form of early enamel caries and to contribute to the increased caries resistance and pigmentation of old teeth.

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