I have tried many whitenings and only crest does its job. I've been using it for four years now. Just do not run into a fake (of course, they are not on the Market. I took them in different stores, everything is ok). Look carefully at the packaging and all the names on it. The Chinese do not fake this packaging, but make it similar, you will immediately see the difference. Now the "glamour" packaging comes with a gold stripe, the design has been slightly changed, and the photo on the Market is outdated.
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