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I'm in my 30s considering teeth whitening. I'm not extremely yellow, but since I drink a lot of coffee, my teeth have become a bit yellow. That's why people suggest using a straw when drinking coffee, but I usually don't use a straw for hot coffee, except for iced coffee.ㅠㅠ
So I want to whiten my skin, but I'm really curious about how the process works, whether it is effective, if I need to do it regularly, and so on.