Enamel is the outer layer of the exposed tooth. It is a hard thin translucent layer of calcified substance that envelops and protects the dentin (the main portion of the tooth structure) of the crown of the tooth.
Enamel is the hardest substance in the body and is almost entirely composed of calcium salts. The hardness of enamel is an important property as the main role of enamel is to protect the softer underlying dentin of the tooth. Enamel also serves as the surface for chewing grinding and crushing of food and this is another reason for its hardness.
This quiz is about part one of the TV show 'The 4400', where 4400 people come back to Earth after being abducted by an unknown intelligent life form. It is a brilliant show, and I hope you enjoy this quiz about it!
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