I recommend Oral-B Glide Deep Clean dental floss.

This is the Oral-B Glide Deep Clean Cool Mint floss, the product I have repurchased the most! The unique feature of this floss is that it has a thick surface area, unlike the common thin strands. Also, true to its name "Cool Mint," using it makes your mouth feel slightly refreshed, as if you had just brushed your teeth again. That's why I like it even more; it makes my mouth feel much cleaner! I started using this floss because my dentist recommended using one as thick as glass noodles, and I am very satisfied. I have already used eight packs. I buy five packs at a time. The price isn't too burdensome, so I cut off long strands to use. You might think that being thick would be hard on the gums, but that isn't the case at all, and it removes debris very effectively. I highly recommend this floss!