Dental floss is able to reach areas between your teeth and below the gum line where the bristles of your toothbrush cannot. These are areas where bacteria exist which cause odor, inflammation, and bone loss. You should floss once a day along with brushing your teeth and tongue twice a day. In some people, other products that reach between the teeth (like a Waterpik) may actually be more effective than flossing. Check out these tips on how to properly floss your teeth.