유노이아담
사용한부분은 부푸는게 좋네요
It's Systema sponge dental floss.
It's 40m, so you can use it for a long time.
I like it because the thread isn't sharp and is soft.
The used parts swell up, so it is easy to tell which parts have been used.
It's reasonably priced, and the mint scent makes me feel refreshed.