Crest night effects?!

Question: I have a kit but it says use by 10/2005
do u think it'll still work?

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Answers: I have a kit but it says use by 10/2005
do u think it'll still work?

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The tooth whitening agents commonly have peroxide as the active ingredient. As time lapses the strength of peroxide may be lost and the kit may not be as effective as a new one.

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