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I tried the overnight paint-on gel, by Crest or Colgate, but I can't remember which. It didn't make my teeth sensitive, but it didn't really do anything else either (like lighten my teeth). I don't understand how that stuff is supposed to work, when it seems like it would all just wash off when you close your lips over your teeth. Mine even came with instructions to keep my lips away (really big grin so they're not touching the teeth) for 30 seconds after application to let it dry -- really annoying!
I'm thinking about trying the Whitestrips though -- sounds much easier, and no worries about it washing away. Has anyone used those?
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