A cord of filaments used to clean between two teeth is flossing. Few people do flossing and do not find flossing important. Flossing is also essential with brushing. Floss cleans in between two teeth. Many bacteria develop between two teeth and cause gum problems. Floss helps to reduce plaque in your mouth. Plaque is a layer, builds up on teeth and causes tooth decay and gum disease. It is recommended that you floss your teeth before brushing. It is also recommended to floss your teeth at least once per day and brush twice per day.