When used with the Sonicare Power Up toothbrush, these Sonicare Power Up replacement brush head bristles provide a gentle clean on teeth and gums. Bristle placement and size are designed to resemble a manual toothbrush head for familiarity. Its bristles help deliver a gentle, yet effective, brushing experience. A fresh brush head every 3 months maximizes the effectiveness of Philips’ unique Sonicare technology.