I mean these: https://www.amazon.co.uk/Interdental-Original-0-4-1-5mm-effe... The problem is that when they encounter a sharp edge, they get torn or cut off. I doubt there has been any research on the ingestion of nylon cuttings, which is why I would prefer to find something as effective but known to be safe.
Yeah sorry I was referring to the dental floss comment I responded to. There’s a lingering belief that PTFE is bad for you, which had more to do with its original production method than the substance itself. Modern PTFE is safe.
