Sonicare Pro Results Plaque Control, 3 Pack, Snap On Electric Toothbrush Head, Standard Size. Densely-Packed, High-Quality Tufts to Effectively Remove Plaque. Specially Curved Power Tufts to Easily Reach Teeth at the Back of the Mouth. Fits All Philips Sonicare Toothbrush Handles Except: PowerUp Battery & Essence. Blue Reminder Bristles Fade to White to Help Recognize Time for Replacement, Use With #HX6511/50 TV #169-476.