The hardest constituent of teeth is

enamel

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dentine

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pulp

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none of the above

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Solution

The correct option is A enamel
The human teeth consist of 3 regions- crown, neck and root. Crown refers to the part that protrudes out of the gums. Neck is surrounded by the gums. Root is embedded in the bone socket. Enamel is the hardest substance of the human body and it is the outer layer of the crown. Dentine is a layer that lies beneath the enamel of the tooth. It has numerous canaliculi passing from the pulp cavity and moving towards the enamel. Dentine encloses the pulp cavity.

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\begin{matrix} Parts of teeth & Description 1. Enamel & i) It is a calcified substance that helps in joining the teeth in the socket 2. Dentine & ii) It consists of connective tissue, nerve fibres, lymph and blood vessels. 3. Cement & iii) It is the outermost layer of the teeth and the hardest substance of the body. 4. Pulp cavity & iv) It joins enamel and pulp. \end{matrix}

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