Compatibility: Brush head compatible with Oral B IO toothbrushes for the following 3/4/5/6/7/8/9/10 series. Versatile use: toothbrushes for children, sensitive teeth and a wide range of models for individual toothbrushing experiences. Rotating pulse brush head: Effective cleaning with rotating pulse to thoroughly reach interdental spaces and remove plaque Bacterial protection: replacement toothbrush head with integrated bacterial protection function for hygienic and safe use. Gentle cleaning: rounded bristle ends for gentle cleaning and a pleasant toothbrushing experience.