That should work.

Theoretically, teeth respond to the total amount of whitener they are exposed to.
So whether you use (say) 14 strips at a rate of once a day or once a week, the total cumulative whitening effect should be the same.

However, using them once a day will likely produce results fast enough that you notice that your teeth are lightening. With a once-a-week rate, you likely won't notice much affect at all but one will have taken place. Sporadic use of strips might be considered "maintenance" whitening.

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