whats a good teeth whitener that you can buy at many stores?

does anyone know any teeth whitening products that are work very well and make a big difference after use? thanks :)
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I've used Crest White Strips a few times now and they always work great. You might experience a little bit of sensitivity, but for me it wasn't anything to complain about, it's harmless and quickly goes away whereas your teeth remain white for years :)
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