I've used regular dental floss of course, but I understand that all those little plastic boxes are bad for the environment, so a while ago I bought a reusable metal tubing with it silk thread. Firstly I don't like silk because I'm as vegan as possible without breaking my back and secondly I don't like silk because I have to use twice as much because it breaks. I was pleased to try this thread and LOVE it. I'm still using my first roller but I've been using it for at least a week and I haven't been gentle with it and it hasn't broken yet. Also, it fits into a metal tube that I already had. Excellent! :)
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