usmile Diamondshine Brush Head with Air-Cushion is compatible with all toothbrushes of usmile, including Y10 PRO, Y10, Y1S, P20 PRO, P10 PRO, P1, U3, etc. First-tier Bristles: The exclusive diamond-embedded design of the whitening bristles offers optimal whitening performance, achieving 440% whiter cleaning. Premium Gum Care: Each filament is at least 90% round to protect your gums in brushing. Fluoride-infused: The bristles release fluoride ions to strengthen the enamel of teeth. Reminder Bristles: The color gradually fades to serve as a reminder for replacement, as recommended by the dentist. Package List: Brush Head x 2