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banjo | 5 months ago (raw) | root | parent | reply | flag 
 actually you shouldn't try whitening...that'll damage your enamel (cleanings, no...)
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MAHDOOD | 5 months ago (raw) | root | parent | reply | flag 
 I know it’s bad so I try not to do it more than once every 18 months.
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banjo | 5 months ago (raw) | root | parent | reply | flag 
 Don't do it--damage is cumulative (i.e. you never grow more enamel--you might be able to remineralize somewhat, but what you have now is all you're ever going to have, and whitening strips off a small layer each tiem you use it.