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Dentin is the main component of animal teeth. It is a highly mineralized tissue, second only to enamel in hardness. About 80% of dentin is inorganic, and the rest is organic. It is mainly composed of dental tubules, dentin fibers and interstitium.<br />Dental tubules are tiny tubes running through the dentin. Between the tubules are the interstitium, which is composed of collagen fibers and calcified matrix.