Multiple choice

The hardest substance of human body is

  1. enamel of incisors

  2. enamel of canines

  3. enamel of premolars

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Enamel is the hardest substance in the human body, rating 5 on the Mohs scale. It covers all teeth - incisors, canines, premolars, and molars. Therefore, saying 'all of the above' is correct because enamel on any tooth type is the hardest substance.

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