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The original Crest Whitestrips have been discontinued. Crest White Strips Supreme take 21 days for a full effect and last for 18 months. In comparison, the regular Whitestrips took 14 days to take full effect, but only lasted for 12 months.

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Q: What is the difference between Crest Whitestrips Supreme and the regular Crest Whitestrips?
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