Replacement Brush heads for Y-Sonic Electric Toothbrush

Description Y-Brush brush heads are flexible to adapt to all jaw sizes and fit the dental arch.  Completely covered with medical-grade nylon bristles, they allow brushing all surfaces of all teeth! When to change the brush head? Every 4 months, as soon as you see that the bristles are worn out.Y-Brush brush heads are designed without latex or silicone. They have 35,000 soft medical-grade nylon filaments to effectively remove dental plaque. These bristles are angled at 45° to follow the Bass method. Y-Brush brush heads are compatible with all different models of toothbrushes: Nylon Start, NylonKids, and Nylon Black.Adult Size (M) For everyone aged 12 and above.Child Size (S) For children aged 4 to 12, as well as adults with a small jaw (without wisdom teeth). What's in the Box? - 1 brush head for the Y-Brush