PS:Suitable for XIAOMI T100 Features: 1. Soft DuPont bristles, compatible for sensitive teeth to use 2. Ultrasonic electric toothbrush can efficiently get rid of plaque and decrease gingival necrosis. 3. Adopt DuPont American tynex usual zero bristles bristles,gently on your teeth. 4 bristle tip diameter, deep clear the gap between enamel 5 accepted by way of FDA and UV sterilized. 6 sealed packing, far more secure to use. 7 update the toothbrush heads every 3 months 8 you've any questions about the toothbrush model, you could consult visitor service. Thank you sealed packing