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Crest Whitestrips work, but don't over-do it. It doesn't do any good to keep them in after 15 minutes, also it could irritate your gums.
I always found it was easiest to do while taking a shower, so you can spit every so often. You don't want to swallow that stuff. Also, take a break from it after about a week. I hear you can do damage if you do it all the time.
My teeth sparkle like the fucking nile and makes everyone in the room get on their knees when I flash my million watt smile.
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