I recommend the Daiso standard thin dental floss, size 420D.

The dental floss I recommend is a product I always use: Daiso's standard, thin 420D floss! Floss comes in various thicknesses, but the 420D I use is the thinnest one sold at Daiso. When choosing the thickness, you can select it based on how wide the gaps between your teeth are! Since my teeth are narrow, I use the thinnest product, holding both ends and inserting it very gently! Daiso products are not only cheap at 1,000 won, but the floss is also fine and sturdy, so it doesn't unravel easily. This is great because it reduces the chance of floss getting stuck between your teeth when using it! Also, the product I use is unscented, but the mint-scented version feels refreshing, so it's a safe and good choice. Let's take care of our dental health with this cost-effective Daiso floss! In the past, when I didn't know any better, I tried to force the thicker product in, but if it doesn't go in, it's better to use the thinner one.