Mohs hardness scale assigns cementum a hardness of approximately which range?

• A. 3-4
• B. 1-2
• C. 2-3
• D. 4-5

Answer: (C)

On the Mohs hardness scale, scratch resistance rises with more mineral content and stronger crystal structure. Cementum, a relatively lightly mineralized tooth tissue that covers the root, is softer than both dentin and enamel. That places it toward the softer end of the scale. The other ranges describe progressively harder materials, so cementum fits best with the softer end rather than the mid or hard ranges.