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Thanks for the info swark.
I have a question regarding the Crest Whitestrips. There seems to be 3 different varieties out there. The regular over the counter kind, Professional and Supreme, each with an increasing concentration of whiteners. Supposedly the "Professional and Supreme" versions are not supposed to bavailable in stores. My question is, do the Pro/Supreme strips offer any increased effectiveness over the regular OTC edition?
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"A casual stroll through the lunatic asylum shows us that faith proves nothing." - Friedrich Nietzsche
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