I have been through tubes of whitening toothpaste and my teeth are not white yet.
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There are also many kinds of over-the-counter teeth whiteners, but they are expensive, have unreliable results, and may actually cause harm to teeth. They are also messy, and some people have even experienced allergic reactions from the bleaching chemicals inside the over the counter teeth whitening kits. It is best to leave teeth whitening to those who are trained to deal with any kind of side effects that may arise. I found a website all about teeth whitening that you should check out http://www.r4md.com/dentistry/#whitening
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