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Is my tooth hard all of the way through?


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Not every part of a tooth is hard, though. Once you get through the outer shell of enamel — which only covers the crown, or area above the gumlines — you reach the dentin and then the pulp (nerve tissues.)

Dentin is much softer. Once a cavity creeps through the strong tooth enamel and reaches dentin, the decay spreads quickly and widely. Why? Because dentin is weaker and less dense.