Begin with 18 inches of floss. It needs to be long enough to wrap around your fingers and be able to move easily to access your molars.
Tightly hold the floss and move it up and down between each tooth in a gentle manner. Have some toilet paper or a tissue handy to wipe away any loose plaque or food pieces. Be extra vigilant around the base of each tooth to carefully access the gum line.
Curve the floss into a C-shape as you clean the base of each tooth to remove any debris from below the gums. Work gently to access teeth close together or tight spaces between teeth. Never force the floss as this can lead to bruised or cut gums and bleeding.