Question:

How long do you wear crest white strips?

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The box said 30min twice a day.

But by twice a day, does it mean 2 strips each day?

A strpi for top and one for bottom? And thats it?

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  1. by twice a day, it means 4 strips a day.

    time 1 = strip for top and bottom

    time 2 = another strip for top and bottom

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