Dentin
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Dentin or dentine is a calcified tissue of the body and, along with enamel, cementum, and pulp, is one of the four major components of teeth. It is usually covered by enamel on the crown and cementum
Cross-section of a tooth. B is dentin.
Dentinal tubules- Microscopic image
Tertiary dentin
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Tertiary dentin is a form of dentin, one of the main component materials of teeth. It forms as a reaction to stimulation, including caries, wear and fractures. Tertiary dentin is therefore a mechanism
Tertiary dentin on the surface of a gorilla tooth. The darker area indicated by the white arrow is tertiary dentin and has formed as a response to tooth wear.