I recommend Jeniton dental floss.

Jeniton dental floss was pretty good.
I received this product for free by participating in an event, and for a free dental floss, it's really good, so I'm using it well.
Actually, food particles tend to get stuck in the narrow spaces between teeth that a toothbrush can't reach with brushing alone.
Jeniton dental floss slides gently into even the narrow gaps between teeth, allowing for clean removal of debris.
And there are some kids whose gums hurt because using the wrong kind of dental floss is too stiff or too strong.
This product is quite soft, and I liked that it swells up just the right amount when it comes into contact with water.
It is a convenient size to carry around, so it is good to take with you while traveling.
The case is pink so you can see it at a glance, which helps me floss every time even when I'm feeling lazy haha.