The Oral-B Precision Clean brush head encloses each tooth for superior plaque removal compared to a conventional manual toothbrush. The bristles get into hard-to-reach places and deep into the interdental spaces and thus ensure effective, precise cleaning and a fresh mouthfeel. The blue indicator bristles indicate when you should change the brush head. The brush head is compatible with all electric toothbrushes from Oral-B, except Oral-B Pulsonic sonic toothbrushes. The scope of delivery includes 5 Oral-B Precision Clean brush heads.