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It is called the enamel. It's the most external layer of a tooth and the hardest substance in the body.
It's called a bridge.
it is called sclera
tooth enamil I believe enamel is the hard, outer covering of a tooth. The soft inner tissue is called pulp.
Your teeth are fixed to your jawbone in your mouth. They sit in a curved line along your top and bottom jaws. The white part of your tooth that you can see when you smile or open your mouth is called the crown. Some of your tooth is hidden under the skin (gum) in your mouth. This is called the root and you cannot see this in your mouth. The white covering on your tooth is called enamel. Dental enamel is strong and helps to protect the tooth. Dental enamel is the hardest thing in your whole body.For further information, go to The British Dental Health Foundation link.
Schlera
relatively thin
enamel is the outer covering of the teeth.
Cementum
The protective covering over some nerve cells is called the myelin sheath.
It is called the cementum and it's the third hardest substance in the human body, after the enamel and the dentin.