When the brush head needs to be changed, the green bristles turn yellow thanks to CleanMaximizer technology. Compared to a standard manual toothbrush, there is up to 100% more plaque and healthier gums. Compared to a traditional manual toothbrush, the Precision Clean brush head's filaments remove plaque to provide better tooth-by-tooth cleaning. All Oral-B toothbrushes are compatible, with the exception of iO and Pulsonic models. From the dentist's toothbrush brand There are twelve toothbrush heads included.