Nylon coated wire. Removes plaque between teeth. Great for: braces, bridges, implants. Press release button to unlock latch. Insert brush into raised hole. Position wire in guide slot. Close latch with a ‘click.' Easy To Use: Use gentle in and out motions to remove plaque and food particles. Never force brush into tight spaces. Do not bend or twist wire during use. Rinse brush and handle after each use. Replace refills WEEKLY uses:#1 interdental brand recommended most often by dental professionals.