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I whitened mine (at home) and it wasn't painful AT ALL!!!
Yellow teeth are not always caused by staining. Some people (my husband being one) were just born with yellower teeth. He's always had yellower teeth than others. In all of his school pix he's got a grim set of choppers. Today, "normal" colored teeth are seen as yellow, so whitening seems to be a necessity to many just to keep up.
He used Crest white strips as I did and he's got a brighter smile. Mine are gorgous and neither of us had any pain. Though, I do agree, that some do.
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