Dental Staff - ...
Sat, 12/24/2016 - 13:28
The Crest.com webpage describing their 'Crest 3D White Supreme FlexFit Whitestrips' product says:
"Usage: Apply once a day for 1 hour. Full results in 21 days."
Especially for new users, it's commonplace to start with a reduced schedule (like every other day, or even more) just to make sure side effects (like tooth sensitivity) aren't going to be a problem for you.
Since teeth whitening is simply dependent upon the total dosage of whitener your teeth are exposed to, doing treatments every day vs. every other day will give the same end result, it just takes longer.
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