Plackers Micro Floss is the best.

I've tried various types of dental floss, but the one I've settled on is Plackers Micro Mint. As you can see in the photo, it is very thin, so it slides right into the tight spaces between teeth to effectively remove debris. Thicker floss can hurt my teeth and gums, but since this one is thin, that doesn't happen. I'm almost out of it, but I plan to stock up on a few more. Since it is officially imported, you can buy it at a lower price if you purchase in bulk! I highly recommend this to anyone who hasn't found the right floss or who bleeds when using regular floss! I take a few packs with me when I go out and share them with friends after meals, and everyone is satisfied. It's also sold at Olive Young, so it's very accessible. If you're curious, give it a try!