dentine

The diameter of dentinal tubule was not uniform due to peritubular dentine was demineralize.

dentine A hard mesodermal material in teeth and some scales (cosmoid, ganoid and placoid scales) produced by odontobasts.

enamel A shiny hard material covering the dentine of teeth and the surface of some scales (cosmoid and placoid scales).

Sugar solutions on the surface of exposed dentine cause water to be drawn out of the dentinal tubules causing which distorts the odontoblast causing pain.