STEPHEN GERARD / SCIENCE PHOTO LIBRARY STEPHEN GERARD / SCIENCE PHOTO LIBRARY
Color enhanced dental x-ray of human incisors. The root of each tooth (pink) is embedded in the jawbone (red top). The green area in the center of tooth is the pulp. The pulp contains veins and blood vessels that provide the teeth with nutrients. Surrounding the pulp is dentin, a hard, porous tissue that composes most of the tooth.
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