and are they harsh on your gums and mouth?
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Crest Whitestrips work extremely well. Depending on which type of them you use, there will either be no pain, some pain, or really obnoxious pain. The 14 days strips cause the least amount of pain, while the premiums cause the most. However, the pain does not last that long. It will be gone within a day or two after you finish the whitening process. For me, the premiums caused sores on my gums, but they went away quickly after I finished whitening. From what I've heard, the 14 day strips are just as good as the premiums only they take twice the amount of time to get to the final stage of white.
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