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Apr 06,  · As I have told the shelf-life of the crest whitening strips is 1 year, but if you keep it as per the instructions, then you can extend the self-life of the strips. You can store these .

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The strips are designed to be used each day, for a maximum of 20 days, with only 30 minutes of application time. One strip should be used for your upper teeth and one for your lower .