Dental floss is a thin, soft thread used to clean the tight spaces between teeth and along the gum line where a toothbrush cannot reach. It helps remove food particles and plaque buildup, reducing the risk of cavities, gum disease, and bad breath. Regular flossing is an important part of daily oral hygiene and is usually recommended once a day.it is typically made of nylon (multifilament) or PTFE (monofilament) fibers, sometimes coated with wax for smoother movement between teeth.