Which of the following is a characteristic of dentin?

Dentin is indeed characterized as a mineralized tissue that consists of collagen fibers. This unique composition contributes to the structure and strength of the tooth, making it crucial for the overall integrity of dental health. Dentin lies beneath the enamel and the cementum, providing a supportive role to these outer layers.

The mineral content of dentin comprises hydroxyapatite crystals, which give it rigidity, while the collagen fibers provide a degree of flexibility. This combination allows dentin to absorb the forces exerted during chewing and grinding, protecting the more delicate pulp chamber located in the center of the tooth.

In contrast, while the outer enamel layer is hard and protective, it is not a characteristic of dentin. Similarly, soft tissue inside the tooth refers typically to the dental pulp rather than dentin itself. Thus, the correct understanding of dentin's composition and characteristics is essential for recognizing its function and significance within the structure of the tooth.