These Oral-B CrossAction replacement brush heads in white are designed for electric toothbrushes to help you maintain a thorough cleaning routine. The medium-stiffness bristles feature a unique X-filament design, angled specifically to reach deep between teeth and clear away plaque along the gumline using an oscillating and rotating movement. Each white brush head includes a built-in wear indicator that fades over time, letting you know when it is time for a replacement, which is generally recommended every three months. This pack contains two heads that are compatible with the Oral-B Pro, TriZone, and Vitality series, though they will not fit iO models.