The calcium-containing connective tissue that holds the tooth in the sockets of the gum is__.

cementum

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dentine

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pulp

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enamel

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Solution

The correct option is A
cementum

The calcium-containing connective tissue that holds the tooth in the sockets of the gum is cementum. Enamel is the outermost layer of the tooth. It is white in colour, is the hardest part and is made of dead tissues. Dentine is the layer of the tooth under the enamel. It is made of living tissue which forms the tooth. Pulp is a soft connective tissue seen in the pulp cavity. Blood vessels, lymph ducts and nerve fibres are seen here.

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Statement 1: Dentine of the tooth consists of dead tissues.

Statement 2: Enamel is the softest part of the tooth and consists of living tissue.

\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}

\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}

Structure of a tooth shows three parts - enamel, ___ and pulp cavity.

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