One of the two biodegradable threads on the market. I have a dense dental alignment and I have no problem inserting the thread into the interdental spaces. It doesn't slip as much as some synthetic ones, but that's why I feel it cleans better. It doesn't break because it is very durable.
The only negative - which the company needs to fix - is the plasticized paper packaging. It should be made of craft paper.

In dense dental alignment, I have 2 to 4 breakages at a time. It is difficult to fit in between and generally makes the process difficult.