what whitens better the two week crest white strips classic or the two hour rembrandt strips?

crest white strips

Question by humphrey: what whitens better the two week crest white strips classic or the two hour rembrandt strips?
i used the crest white strips classic last summer and they worked great.
but the whitening only lasts a year and now i need to redo it.
but for crest strips they whiten in two weeks and the rembrandt in 2 hours so what works better?
or is it the same?


Best answer:
Answer by LeBellerembrandt

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