From Longman Dictionary of Contemporary Englishdental flossˌdental ˈfloss noun [uncountable] DCBthin strong string that you use for cleaning between your teeth
Examples from the Corpus
dental floss• In the bathroom she slid dental floss in and out between her teeth.• I manoeuvre the dental floss into place in front of an aghast Lucker, and whip them away, as Laverne instructed.• Use dental floss to sew buttons on to heavy fabric such as coats.• The best way of gittin' them off is with dental floss. 