Features: 1. Soft DuPont bristles, appropriate for touchy enamel to apply 2. Ultrasonic electric toothbrush can efficiently get rid of plaque and reduce gingival necrosis. 3. Adopt DuPont tynex classic zero bristles bristles,gently in your teeth. four bristle tip diameter, deep clear the gap between enamel 5 permitted through FDA and UV sterilized. 6 sealed packing, far more safe to use. 7 update the toothbrush heads each 3 months eight heads are designed for Mijia T100 Sonic Electric Toothbrush.