Dentin is living or non-living?

Answer:

The portion of the tooth that is normally visible above the gum-line is called the crown and the portion below the gum line is called the root . As we move closer to the tip of the crown, we say we are moving coronally and as we move closer to the tip of the root we are moving apically . The crown is covered with a thin coating of non-living, nonporous enamel which is the hardest substance in the body. Underneath the enamel of the crown is a living tissue called dentin .

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