[Bihar CEE 1995]
A) $ Ca_3{{(PO_4)}_2} $
B) $ CaF_2 $
C) $ CaCl_2 $
D) $ CaBr_2 $
Correct Answer: B
The enamel of our teeth is the hardest substance in the body made up of $ CaF_2 $ and dentine below it made of $ Ca_3{{(PO_4)}_2} $ .
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