Tooth enamel is the hardest and most highly mineralized substance of the body, and with
dentin,
cementum, and
dental pulp is one of the four major tissues which make up the
tooth. It is the normally visible dental tissue of a tooth and must be supported by underlying dentin. Ninety-six percent of enamel consists of mineral, with water and organic material composing the rest. The normal color of enamel varies from light yellow to grayish white. At the edges of teeth where there is no dentin underlying the enamel, the color sometimes has a slightly blue tone. Since enamel is
semitranslucent, the color of dentin and any restorative dental material underneath the enamel strongly affects the
appearance of a tooth. Enamel varies in thickness over the surface of the tooth and is often thickest at the
cusp, up to 2.5mm, and thinnest at its border, which is seen clinically as the
cementoenamel junction (CEJ).
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