Replacement brush heads for Philips Sonicare C1, C2, G2, W2 ProResults, effective plaque control and compatible with Sonicare Series 2 and 3 FlexCare. Compatible with the following Ph-Soni Care handles: • Diamond Clean • Fresh White • Fresh White+ • Platinum Smoothing • Smoothing+ • Smoothing • Water Clean • Power On • Soni Care Series 2 Plaque Control • Soni Care Series 3 Gum Health • Soni Care Easy Clean • Soni Care Kids. Compatible with the following Sonicare electric toothbrush models: Compatible with Sonicare HX6. Series: HX6014/13, HX6100, HX6150, HX6160, HX6201, HX6210, HX6211, HX6212, HX6220, HX6221, HX6231, HX6232, HX6240, HX6250, HX6251, HX6252, HX6253, HX6280, HX6311, HX6320, HX6322, HX6330, HX6340, HX6411, HX6431, HX6500, HX6511, HX6512, HX6530, HX6552, HX6610, HX6631, HX6712, HX6720 HX6721, HX6722 HX6730 HX6732 HX6733 HX6750 HX6761 HX6780 HX6781 HX6782 HX6810 HX6815 HX6817/01 HX682A HX682P HX6848 HX6902 HX6903 HX6910 HX6911 HX6920 HX6921 HX6932 HX6934 HX6950 HX6952 HX6970 HX6972 HX6973 HX6985 HX6992 Suitable for Sonicare HX8 series: HX8910 HX8911 HX8918 HX8920 HX8923 HX8931 Suitable for Sonicare HX9 series: HX9023/64 Reminder bristles for models HX9024/25, HX9110, HX9111, HX9112, HX9120, HX9140, HX9141, HX9142, HX9150, HX9160, HX9171, HX9191, HX9194, HX9311, HX9322, HX9330, HX9331, HX9332, HX9334, HX9336, HX9340, HX9342, HX9350, HX9351, HX9352, HX9360, HX9361, HX9362, HX9370, HX9371, HX9372, HX9381 and HX9382 alert you when it's time to change the brush head. After three months of normal use, bristles will show signs of wear and the brush head's cleaning effectiveness will decrease. It is recommended to replace the brush head every three months.