The innovative cleanmaximiser technology dyes green bristles yellow, thereby indicating the optimal time for the brush head for the best cleaning. The Precision Clean brush wraps each tooth individually and reaches hard-to-reach places to remove up to 100% more plaque than a conventional manual toothbrush. Compatible with all Oral-B handpieces, except Pulsonic & io. Set Contains: 10 x Oral-B Precision Clean brush heads individually packed for hygienic reasons