Which type of dentin constitutes the majority of the dentin structure?

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Dentin surrounding the tubulesThe outermost layer of dentin near the enamelDentin located between the dentinal tubulesThe initial unmineralized dentin matrixNone of the above

Explanation

Peritubular dentin (A) forms the walls of dentinal tubules, while mantle dentin (B) is the outer layer near enamel. Predentin (D) is the unmineralized precursor of dentin. The largest portion of dentin is intertubular dentin (C), which lies between the tubules and provides most of the dentin's bulk.