Sonic S10/S20 Vitis Average Head The Vonic Sonic S10 and S20 brush heads have an optimized design: small or access size and rounded ends to facilitate cleaning of hard-to-reach areas. The bristles are made of high-quality Tynex® with rounded ends that allow una effective brushing that protects teeth and gums. | They have a flat profile and una exclusive distribution of filaments with una Monotip attachment zone to break through the most resistant dental biofilm. They also have a protective cap to protect the filaments from external contact, thus preventing contamination. The cap has holes to allow air to pass through, facilitating rapid drying.