Which of the following is the hardest tissue in the body?

The hardest tissue in the body is enamel. Enamel is the outermost layer of a tooth and serves as a protective coating. It is composed primarily of hydroxyapatite, a crystalline calcium phosphate mineral that provides exceptional hardness and strength. This quality allows enamel to withstand the forces of chewing and protects the tooth from decay and damage.

The unique structure of enamel, which is made up of tightly packed enamel prisms, contributes to its remarkable durability. This makes it the hardest and most mineralized tissue in the human body, even more so than dentin, cementum, or bone, which are also important tissues but do not exhibit the same level of hardness and resistance to wear as enamel does.