I have a retainer that I wear regularly after getting my braces off. I really want to whiten my teeth and I've been told by a friend that I could buy the carbamide peroxide 22% gel and use it in my retainer instead of having to pay for the trays to put the gel in. Is this true... is it safe to use this gel in my retainers and if so, how long can I keep it in for? Will the gel harm my retainers? Many thanks!
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You could try http://freewhiting.imagezu.com . If not than you have nothing to lose. It should be whiter for sure. Safe? using too much in long period of time than is not safe for enamel over all is really safe.
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