DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Enamel hypoplasia. Polarised light micrograph of a section through the crown of a tooth. The crown is the visible part of the tooth. It consists of dentin (blue and orange) covered by a layer of enamel (yellow). Here there are holes in the enamel layer, a condition known as enamel hypoplasia. There are a number of causes of this condition including infection, trauma, toxins and malnutrition. Often the cause is not known.
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