The Oral-B Pro Precision Clean toothbrush milk is perfectly adapted to each tooth and removes up to 100%more plaque than a hand toothbrush. The original Oral-B brushes have new X-shaped bristles that clean up areas that traditional bristles do not reach. Green signaling will become yellow over time, depending on individual use, indicating the optimum time for brushing replacement for 100%cleaning efficiency. It is guaranteed to fit all Oral-B reloadable toothbrushes except Pulsonic and IO.