Flossing needs to be done once every day. It is important to floss because your toothbrush can't get everywhere in your mouth. If you learn how to floss correctly, you can get all those tiny spots your toothbrush misses and make your teeth super clean. If you're just learning how to floss, ask your parents or dentist to show you how to do it right. Get a good grip on your dental floss. Use a piece of floss about 18 inches long, and wrap the ends around your middle fingers, leaving about 2 inches between them. Using your thumbs and forefingers, slowly work the floss in between the spaces where teeth touch. Be careful you don’t snap the floss against your gums. Curve the floss around each tooth in a “C” shape and gently move it up and down the sides of each tooth, including under the gumline. Use a new section of floss for each tooth.