At Coolblue, you find good Oral-B brush attachment promotions. That way, you replace your Oral-B attachment for a sharp price. Note that you buy Oral-B brushes that match your toothbrush model. For example, there are brush attachments for the Oral-B iO toothbrushes, but also for the Pro models. The Oral-B brush attachments have to be replaced after about 3 months. Get a supply of brush attachments. That way, you don't have to buy new ones for a while.