I heard that they're bad for your teeth... Is that true?
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I think I heard that with over use, they can damage the enamel on your teeth. They do work..and work really well. My teeth were at least 5 shades whiter. Some people experience sensitivity to cold and hot when using the strips. You can use a toothpaste for sensitive teeth (Sensodine) 2 weeks before you plan on using the strips, and you won't have that problem. If you don't use it, and find your teeth and/or gums become sensitive, then you should only use the strips once a day, instead of twice. Also, never use the strips back to back (2 strips in 30 minutes)...or leave on longer than the directed time.
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