김민정
I'm very interested in teeth whitening.
Maybe it's because I often drink mixed coffee, and my teeth seem to have turned yellow.
Can mixed coffee cause teeth to turn yellow?
Will brushing your teeth immediately after drinking coffee significantly improve the situation?
I used a whitening toothpaste, and I think it was effective for whitening, but I felt that my gums were getting worse.
Can using whitening toothpaste cause significant damage to the gums?
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