Abstract
The trace element composition of sound enamel was found to be the same in the outer and the inner enamel. A very slight increment in Zn, Pb, Cu, Sn and Al occurred in sound enamel of older teeth. Two to three times the Zn and Pb, Cu, Sn, and Al content was found in outer diffusely discoloured “sound” enamel from the same teeth. The fluoride content in this enamel was 10 times that of adjacent completely sound enamel. Pre-carious white and brown spots had a variable but high level of trace elements with Zn and Cu higher in the younger than the older teeth. Cobalt was found in neither the sound nor the precarious enamel.
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