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유튜브 한번 찾아보세요 ㅜ 이게 말로 하기가 좀 어렵네요..
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I was recommended to use dental floss, so I bought some. How do I use this? Do I insert one piece into both sides and then floss from the outside of the mouth? Or do I insert it into only one side and try to saw back and forth, but then I have to use my hand from inside, which is difficult... I don't know how to do it comfortably.