Is it okay to put a 'bottom' teeth whitening strip on your top teeth?

Somehow we've used up all of our 'top' teeth Crest Whitening Strips, and I was hoping to put in some strips tonight, so I'm wondering if it'd be okay and beneficial if I put a strip that is marked for my bottom teeth on my top teeth? would the only difference be that it doesn't cover all of the top teeth? will that look weird if it whitens at all? thanks a bunch! :) xoxo
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