PS:Suitable for XIAOMI T300,T500Features:1. Soft DuPont bristles, appropriate for sensitive teeth to use2. Ultrasonic electrical toothbrush can effectively remove plaque and reduce gingival necrosis. Adopt DuPont American tynex common 0 bristles bristles,gently on your tooth bristle tip diameter, deep clean the gap between teeth5 accredited through means of FDA and UV sterilized sealed packing, much more secure to use replace the toothbrush heads every single three months8 you've any questions about the toothbrush model, you may seek the advice of customer service. Thank you sealed packing