dental floss

soft thread used for cleaning the gaps between the teeth 洁牙线（用以使牙缝清洁的软线）.

deniable, denial, denier, denigrate, denigration, denim, denizen, Denmark, denominate, denomination, denominational, denominator, denote, denouement, denounce, dense, denseness, density, dent, dental, dental hygienist, dental plate, dental surgeon, dentifrice, dentist, dentistry, denture, denudation, denude, denunciation, deny, deny sth. to sb., deodorant, deodorize, deodorise, dep, depart, depart from, departed, department, department store,