은하수
As I get older, my teeth seem to be getting more and more yellow. I never really cared about it until recently, but then I looked in the mirror and wondered, "Are my teeth always this color?"
So, I suddenly thought I should get my teeth whitened. I have a lot of questions about teeth whitening, but one of them is how long it lasts. Teeth whitening will definitely make your teeth whiter, but how long will that whiteness last?
I sometimes wonder if it's really necessary to get teeth whitening done if the duration is too short.
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