Suitable for all mouth types and great with braces, ORDO's Sonic Kids Rechargeable Brush Heads are engineered for an optimal clean. The soft, individually rounded bristles are gentle on kids' teeth and gums, yet effective at removing plaque and debris. Compatible with the ORDO Sonic Kids Rechargeable Toothbrush, including Squishmallows designs, the four-pack of replacement heads offers up to one year of brushing. Please note: Not compatible with the ORDO Sonic Kids Battery Toothbrush.