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Go to your dentist - they sell these Whitestrips Supreme (i believe that's the name they gave it, I was just there). They're different from the the over the counter type in that it takes 3 weeks instead of 2, and has a higher concentration of the whiteners. I saw some fact sheet that says it's as affective as 4 over the counter types. It costs about 50-60, instead of the regular 25-30, but it's worth it.
You will definitely notice a difference, it's great. I'd highly recommend going out and buying a tube of Arm and Hammer Advance White toothpaste as well, it really helps maintain the whiteness, I get compliments all the time now.
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