Dentin is composed of approximately 70% mineral content, primarily hydroxyapatite crystals, which provide its hardness and rigidity necessary for tooth structure. This mineralized matrix forms the bulk of dentin, sandwiched between the enamel and the dental pulp. The remaining composition includes about 20% organic material and 10% water, which contribute to its resilience and slight flexibility. Understanding the high mineral content is crucial during restorative procedures such as cavity preparation and bonding, as it influences etching time and adhesive penetration. Excessive removal or damage to the mineralized dentin can compromise tooth integrity and restoration success.

Reference: Oral Histology, B. K. Shambaugh, 13th Edition.