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It seems that my teeth become more yellow as I age.
There is a lot of interest in teeth whitening.
Maybe because I usually drink a lot of kimchi and coffee.
I'm worried that maintaining teeth whitening might not be difficult, but I can't live without eating, and I'm concerned that eating dark-colored foods might cause my teeth to revert back to their original color.
How long does the whitening effect last after getting teeth whitening?