Enamel covers the crown of the tooth.
Teeth play an important role in digestion and absorption in humans and other vertebrates. Humans consume food throughout their lives. As a result, teeth must be extremely hard and tightly rooted in order to survive years of chewing. The white, exposed part of the tooth is covered by enamel layer. This is the body’s hardest material.
Enamel is extremely durable and transparent, allowing light can be observed through it. Enamel is the body’s toughest tissue, but it is free of living cells. It implies that if a tooth is chipped or damaged, it would not be able to heal on its own.