Abstract: Monofilament dental floss/tape of polymer material including fluoride and polishing powder the dental floss/tape (1) being ribbon-shaped and having material properties that enable it to be stretched to increase its length by at least 100% and also to reduce its cross-sectional area by up to ten times, and also a method fot the use of monofilament polymer dental floss/tape (1) by preparing a suitable length of dental floss/tape (1) for cleaning the teeth , by extending it to a reduce cross section so that the area of the whole piece of floss/tape can thereafter be used to clean the teeth distally and/or mesially.