The hardest substance in the human body is tooth enamel.
Why is Enamel So Hard?
Highly Mineralized:
- Enamel has a lot of minerals in it, about 96%.
- The main mineral is called hydroxyapatite, a type of calcium phosphate.
- This mineral makes enamel very strong and tough.
Protective Layer:
- Enamel covers the crown of the tooth, which is the part you see above the gum line.
- It acts like a hard shield, protecting the softer parts inside the tooth from damage when you chew, bite, or eat hot or cold foods.
Comparison to Bone:
- Bones are also strong but not as hard as enamel.
- Bones have less mineral content and are more flexible because they have collagen fibers, which help support the body.