Why Are Teeth White?

Answer

Teeth are white because they have an outer coating called enamel, which is mostly made up of calcium and is itself white in colour. However, enamel can differ in colour as from yellowish to greyish.
Q&A Related to "Why Are Teeth White?"
There are several ways that you can go about getting white teeth. If you can't afford to get a cleaning at the dentist, you can try Rembrandt, its like a do-it-yourself tooth whitener
http://www.ask.com/web-answers/Health/Other/how_to...
Enamel, because it is coloured white and teeth are covered in it.
http://wiki.answers.com/Q/Why_are_teeth_white
Dental fluorosis is the result of consuming too much fluoride in earlier years. The condition is permanent, but so far only appears to be cosmetic damage. The spots cannot be removed
http://www.ehow.com/facts_5746339_do-white-spots-t...
Assuming that people in the US do indeed have whiter teeth than most, it is likely. because we recognize the benefits and impact of a great smile and because a large market for whitening
http://www.quora.com/Health/Why-do-Americans-have-...
2 Additional Answers
Teeth are white because they are composed of calcium, phosphorus and other mineral salts. The combination of these are what give teeth their white appearance.
Why are teeth white depends on the health of them. Some people have white teeth because of the toothpaste you use. Teeth may also be white because of genetics.
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