Dentin

Dentin is the most abundant dental tissue which determines the size and shape of teeth. Dentin is found just under the enamel in the crown and under the cementum in the root. The unique structure and composition of dentin allows it to function as the substructure for rigid enamel tissue thereby providing teeth with the ability to flex and absorb tremendous functional loads without fracturing.

Dentin also gives the tooth its color and so to change the color of the tooth the color of the dentin must be changed.