A) Calcium carbonate
B) Limestone
C) Calcium phosphate
D) Calcium fluoride
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The correct answer is C) Calcium phosphate
Tooth enamel is the hard, protective outer layer of the tooth that covers the crown (the visible part of the tooth above the gum line). It is made up mostly of a mineral called hydroxyapatite, which is a form of calcium phosphate. This material gives tooth enamel its strength and hardness, allowing it to resist the wear and tear of chewing and biting.
Additional Information
A) Calcium carbonate: Calcium carbonate is a chemical compound that can be found in many natural substances, such as limestone and pearls, but it is not a main component of tooth enamel.
B) Limestone: Limestone is a sedimentary rock that is composed mostly of calcite (calcium carbonate) and aragonite (a mineral form of calcium carbonate). While limestone contains calcium, it is not the main component of tooth enamel.
C) Calcium phosphate: Calcium phosphate is a mineral that makes up about 70% of tooth enamel. It is the main mineral component of tooth enamel, providing it with its strength and hardness.
D) Calcium fluoride: Calcium fluoride is a mineral that is often added to toothpaste and other dental products as a source of fluoride, which can help to prevent tooth decay. While fluoride is important for oral health, it is not a main component of tooth enamel.