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if you put the strips on badly perhaps. The gel on the strips expands a bit to get the sides of your teeth. My bottom rom of teeth are kind of crooked but I didn't notice any stripes or missing bits. The strips worked well on me i guess, my teeth whitened considerably after the two week period.
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"Asking a bomb squad if an old bomb is still "real" is not the best thing to do if you want to save it." - denim
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