I've been using 30% Carbamide Peroxide whitening gel in the trays for about 30 m... | Hacker News

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dezork on March 13, 2016 | parent | context | favorite | on: I made my own clear plastic tooth aligners and the...

I've been using 30% Carbamide Peroxide whitening gel in the trays for about 30 minutes a day. So yes, they are whiter.

KRuchan on March 14, 2016 [–]

Could you share a link if it can be bought online?

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