High-low bristles. Up to 5x more plaque removal along the gumline (vs a regular manual toothbrush). Fits most Oral-B power brushes. No. 1 used by dentists worldwide. Cleans better 3X longer vs store brand refills (after 13 weeks vs 4 weeks of comparable store brand use). Does not fit: Pulsonic; 3D White Battery; Complete Battery; Pro-Health Battery. 1. Features end-rounded bristles for cleaner teeth & healthier gums (vs a regular manual toothbrush). 2. Indicator bristles signal time to replace brush head. Dentist recommend changing your brush head every 3 months. 3. Interchangeable brush head: Floss Action; 3D White; Dual Clean; Sensitive Gum Card; CrossAction; Deep Sweep. www.oralb.com. Customer Service Number: 1-800-56-OralB (1-800-566-7252). www.pg.com. Made in Ireland.