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Which whitening patch is good?

I have used whitening patches before, but I didn't see much effect.

I understand that the peroxide content is low, but how high should the hydrogen peroxide content be?

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    케이스
    저도 아주 오래전에 미백 패치 했다가 속았다고 느끼고 그 이후 미백패치은 쳐다도 안보내요.