Bridges, Braces, Implants and Wide Spaces: Using the stiffened end, thread the spongy-floss between teeth and appliance or through wide spaces. Use a soft back-and-forth motion to 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.