Originated From Dental Smarts
No, not that I've ever heard of. I just don't think that most treatments are permanent... so you have to do it every time it fades.
If something is not approved by the ADA I won't use it , ADA (American Dental Association)
I would not also use something containing Chlorine Dioxide as a bleaching agent and that is not FDA approved.
http://smile4youreviewed.com/illegal-teeth-whitening/
no, it is not damage.
http://www.smile4youreviews.com/
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Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them