Replacement brush heads, suitable for use with the Kidzsonic Electric Toothbrush 3-6 years. The Flossing Bristles help to clean in-between teeth. Short bristles clean the tooth's surface and longer bristles reach between teeth and into the gum line. These unique bi-level bristles remove plaque not reached by conventional toothbrushes. Great for kids who are not yet able to floss, have gaps or missing teeth.