Direction for use: Using the stiffened end, thread the spongy-floss between teeth and appliance or through wide spaces. Use a soft back-and-forth through to help remove bacterial plaque. Pull the spongy-floss through to the regular floss section. Gently slide the regular floss UNDER THE GUMLINE Use an up-and-down motion to help remove plaque. Regular Teeth: Gently slide regular floss between teeth and UNDER THE GUMLINE. Clean under the gumline as directed above. Use a fresh section of floss for every tooth.