A) Dentine
B) Compact bone tissue
C) Periosteum
D) Tooth enamel
Correct Answer: D
Solution :
Tooth enamel is the hardest substance in the human body and many other animals, including some species of fish. Enamel is made of calcium phosphate. The strength of the enamel is due to the highest percentage of its mineral contents. It contains about 96% minerals. Tooth decay could be treated with fluorides and calcium to build back its strength.
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