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The Curious Bag
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<h4 class="dechead">On One Hand: They are Safe
When used as directed, Crest Whitestrips are safe. They contain the same ingredients dentists use when they whiten patients' teeth. You put the strips on your upper and lower teeth. Depending on which type of Whitestrips you have, use them either once or twice a day, usually for 30 minutes at a time.
On the Other: Your Teeth May Be Sensitive
Some people may experience sensitivity in their teeth when using the Whitestrips. In that case, use them every other day instead of daily. If that doesn't help, you should stop using them. You can also try using a soft-bristled toothbrush during the period that you are using the Whitestrips to see if that helps with the sensitivity.
Bottom Line
The main ingredient in Crest Whitestrips is hydrogen peroxide. The U.S. Food and Drug Administration, Health Canada and experts from the World Health Organization approve of the use of hydrogen peroxide. Even if you swallow a strip, it will simply pass through your system without causing damage.
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