Human teeth are almost as hard as diamonds.

Although the hardness of the teeth leads some people to believe that they are bones, the truth is that they are not. Simply, they include in their composition a hard and resistant material in more proportion than other parts of the human body.

Teeth are made up of three main layers: the outer layer is the enamel, the middle layer is called dentin, and the inner layer is the pulp. The first covers the outside of the teeth, is between 2 to 3 millimeters thick and is insensitive to pain because it does not have nerve endings. The dentin, which gives the tooth its white color, also has a certain hardness.

The white enamel that covers the teeth is the hardest substance in the body, even harder than the bones. This surface is elastic and 96% mineral, a higher percentage than any other human tissue, making it resistant to damage, according to the American Dental Association.

Likewise, the enamel of human teeth has such a great durability that it allows them to resist deterioration for hundreds of years. Thanks to the teeth, we can know that the first humans who traveled from Africa to China left about 80,000 years ago.

While tooth enamel is not really as hard as diamond, it does outperform metals like gold, silver, iron, and steel in this category, although it breaks more easily.

After the teeth, a part of the human body that stands out for its hardness are the bones, hard structures made up of a protein framework of collagen and calcium phosphate. The hardest, longest and most voluminous of them is the femur, located in the thigh and which serves as a support for the human upper body. The jaw is another exceptionally hard bone.

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