New 5 PACK Crest Braces Care Floss Threader 30 Single Use Packets. Braces wearers have special oral care needs making them more susceptible to odor, stains, and cavities. Maintaining an oral hygiene routine is more important than ever. The oral care experts at Crest have brought you a line of products to protect your gums and your smile. Crest Braces Care Threader Floss comes in convenient single-use packets containing one piece of floss with built-in threader tip that inserts easily and smoothly under braces and expanders. From the makers of Oral-B. Suitable for all braces wearers ages 6+