I recommend Oral-B dental floss.

I've tried almost all the dental floss products available at the pharmacy, and the Oral-B product was the easiest to use.

It is sturdy and comes off smoothly.

Food particles tend to get into my gums easily, so I am using dental floss, interdental brushes, and a waterpik as a set.

You can use dental floss of a thickness that fits your gums, and instructions on how to use it are well explained on YouTube.