EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Tooth enamel. Coloured scanning electron micrograph (SEM) of a section through tooth enamel. The enamel is the outer covering of the crown (visible part) of the tooth. It is the hardest substance in the human body. It is composed of rows of calcium and phosphorous salts embedded in a protein matrix. Magnification: x1000 when printed 10 centimetres wide.
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