With the Oral-B brush attachments, you can keep your teeth clean. By brushing often, the hairs of the Oral-B brush wear and lose their effectiveness. That's why we recommend replacing the brush attachment every 3 months. Be sure to check which Oral-B attachments fit on your toothbrush. There are brush attachments for the Oral-B iO toothbrushes, but also for the Pro models. Which Oral-B brush attachment you need depends on your needs. There are brushes for whiter teeth and sensitive gums, for example.