The Oclean P1C10 replacement brush heads are designed to maintain a high standard of oral hygiene by effectively reducing plaque build-up along the gumline. Each pack contains two grey, round-shaped heads crafted from FDA-approved oral safe materials, ensuring a gentle yet effective clean for adults. These medium-stiffness bristles are compatible with a wide range of Oclean electric toothbrush handles, including the X, X PRO, Z1, F1, One, and Air 2 models. To keep your brushing experience efficient and hygienic, it is recommended to replace the head every three months.