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Why should I need my teeth whitened? This is a no brainer at all. As we get older, our teeth tend to get darker which is caused by the food we intake. Another factor also would be the drinks we take as well as the any other eating habits that can take effect on our teeth. Antibiotics also have the tendency to make our teeth dark as well. While only a few people have the perfect brilliant white teeth, we must make an effort to make them white as well. This may be a hard task as some people naturally have grey shade of teeth or whitish spots in them. This might be a sign of tooth decay or problems while their teeth were forming. Calculus or more commonly known as tartar can also take effect on the color of your teeth making then stained on the surface.