The Oral-B 3D White electric toothbrush replacement head features a specially designed polishing cup to help remove surface stains while bristles clean away plaque, making it ideal for advanced cleaning and whitening. Round brush head is inspired by dental professional tools for a tooth-by-tooth clean, with specially engineered bristles for optimal tooth coverage. Indicator bristles signal time to replace brush head. Dentists recommend changing your brush head every 3 months.