Compatible with Oral b these models: *Professional Care, *SmartSeries, *Vitality, *ProHealth, *Advanced Power, *CrossAction Power. Professional Care: 500, 550, 1000, 3000, 2000, 600 , 1000 ,3250, 5000, 5500, 6000, 6500, 7400, 7500, 7550, 7850, 7875, 8000, 8300, 8500, 8850, 8860, 8875, 8900, 8950, 3D Excel, Plak Control 3DTriumph Professional Care: 9000, 9100, 9400, 9425, 9450, 9475, 9500, 9900, 9910, 9930, 9950 Trizone: 600,1000,3000,5000 Triumph: 5000 wireless SmartGuide, 4000, Triumph 5000 inkl. Smart Guide Smart Series: 4000, 4750, 5000, SmartSeries 4000 , SmartSeries 5000 with SmartGuide, Oral B Vitality Precision Clean Oral B Sensitive Clean Oral B White Clean Advance Power: 400, 450, 450TX, 800, 850, 900, 950, 950TX, Plak Control: Duo, Travel, Duo Interclean: IC2522, ID2021, ID2025, ID2025T Does not fit Sonic Series. Please note: Our brush heads are only Oral-B compatible, we have no affiliation to the Oral-B company or brand or any related company. We are Green Laurels, not Oral-B.