Hi Megan, about 5 years ago, I used over the counter whitening kit - I believe it was 5min per day for 2 weeks, and I didn't have problems with sensitivity. I do remember that it helped whiten my teeth but it was max 2 shades whiter then original. This time I decided to do Zoom and I got 6-7 shades lighter teeth.
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Posted to $99 Deal on Zoom Whitening - Chandler AZ on 19 Dec 2012