Dentin is harder than bone (according to Britannica, but I couldn't find any indication of this in wikipedia), but softer than enamel. The hardness is determined by the percentage that is minerals.
Enamel is 96% minerals. Dentin is 70% minerals. Bone is also 70% minerals (although there are multiple types of bones).
Dentin is not to be confused with Dentyne, the Brush Your Breath gum that helps keep breath fresh.
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