Is the BURST Floss waxed? October 22, 2021 20:01 Updated Yes, The BURST Floss uses Microcrystalline wax, there are No PFAs. Related articles Why is the BURST Floss black? How long is the BURST Floss Refill and how long should it last? Why does the BURST Floss get stuck in my teeth sometimes? Is the BURST Floss biodegradable? How thick is the BURST Floss strand?