It's dental floss.

I use thin thread because there is almost no gap between the teeth.

If it's thick or average, it doesn't go in easily.

And I don't use it because the gaps between my teeth have widened.

This dental floss is hygienic because it uses dental floss wax treatment technology that leaves almost no wax residue.

It feels unpleasant and inconvenient to use when wax remains, but since I hear there is almost no residue, I can use it with confidence.

Making flossing a habit is good for removing plaque, food debris, and foreign substances.

And it is effective for preventing cavities.