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가는 실이 잘 들어가기는 하더라고요.
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There is also a thickness to dental floss.
Which thickness should I choose?
I usually choose the middle option when I don't know.
I am doing it.
Since individual differences exist in taste, there is no definitive answer.
It's easier than something that's difficult to enter, even if it doesn't exist.
It would probably be better to choose to enter.