STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Tooth enamel. Coloured scanning electron micrograph (SEM) of a freeze fracture 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 phosphorous salts (light brown) embedded in a protein matrix (darker brown).
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