Question

Which of the following describes dentin? Option 1: A cell-free protective layer over the crown. Option 2: A connective tissue layer covering the root of the tooth. Option 3: A soft tissue found in the pulp cavity. Option 4: A yellowish tissue forming the bulk of the tooth.

Answer 1

Dentin is a yellowish tissue that forms a majority of the tooth. It is found under the enamel and surrounds the pulp cavity. The dentin layer is vulnerable to decay when the protective layer of enamel is damaged.

Step-by-step explanation:

The correct description for dentin, given the choices, is Option 4: A yellowish tissue forming the bulk of the tooth.

Dentin is the layer of the tooth that lies beneath the enamel and above the pulp. It is dense and similar to bone. Unlike enamel, dentin is not as hard, and it's more vulnerable to decay when the protective enamel gets damaged.

The structure of the tooth starts with the outer surface which is referred to as the crown. The crown is covered by enamel, known as the hardest substance within the human body. Beneath the enamel-covered crown, you would then find the relatively hard dentin, which extends into the root of the tooth. The dentin surrounds the innermost pulp cavity, which contains a mass of soft connective tissue known as pulp.

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