What does the charcoal within the BURST floss do? Megan B January 07, 2021 21:04 Updated The charcoal aspect of the floss is antimicrobial and helps to lift stains from your teeth while flossing. Related articles Is the BURST floss biodegradable? BURST Floss Manual How is the BURST Floss different than other Floss? Can I buy another BURST floss case by itself? Why does the BURST floss get stuck in my teeth sometimes?