- For medium-sized gaps between teeth: the original yellow 0.7 mm interdental brush is designed for medium-sized spaces between the inside of the teeth and the gums to reduce plaque. - Soft coated wire toothbrush: TePe interdental brushes are fully coated with no sharp or exposed metal to hit or cut the sensitive gum area, making your daily dental routine pleasant. - Dual-purpose cap protector: these interdental cleaners have a handy cap that protects the brush when not in use and even extends when attached to the handle for maximum access.