Better late than never :-) I actually used BriteSmile. I researched Zoom and heard it hurts a lot worst than Britesmile. I can only imagine. The only way I would do another session is with some strong pain killer before, during and after the treatment. It was so bad for me I can still remember the pain as if it was yesterday. It's been over 3 years.
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Posted to Teeth Whitening Hurt, but Brightened my Smile on 7 Jan 2011