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How long should the whitening effect last?

Because I like coffee, my tooth color isㅠㅠ

Whitening toothpaste doesn't have much effect, and it causes sensitivity and doesn't feel refreshing, so I want to get teeth whitening.

Is teeth whitening effective after just one treatment?

How many times do I need to do it for it to be effective?

I'm curious if it will cause any discomfort when doing it.

 

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    보리콩까미
    저도 미백에 넘 관심있거든요,,
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