Oral-B Whitening Brush EB18R-4HB, 4 Replacement Brush Heads Brand new, unopened, domestic product The newly introduced X-filament, with its cross-shaped bristles, removes even fine plaque from the surface of the teeth, achieving the highest plaque removal power in the Oral-B market. In addition, it is equipped with replacement signal bristles that change color to indicate when to replace the brush head, prompting replacement at the correct timing to ensure this maximum plaque removal power is always maintained. Whitening rubber cup removes stains ● X-shaped special bristles scrub away dirt from small areas that regular bristles can't reach. ● The green bristles change color to indicate when to replace the brush head, maintaining the best plaque removal power (※1). ● Genuine Oral-B replacement brush heads... Can be used with all Oral-B round rotating brushes, excluding the iO series. ※1: By replacing the brush head appropriately, the condition is maintained as when it was new.