PS:Suitable for SOOCAS X1/X3/X3U/X5 Features: 1. Soft DuPont bristles, appropriate for sensitive teeth to apply 2. Ultrasonic electric toothbrush can effectively get rid of plaque and reduce gingival necrosis. 3. Adopt DuPont American tynex standard 0 bristles bristles,gently in your teeth. four bristle tip diameter, deep clean the space between tooth five authorized by way of FDA and UV sterilized. 6 sealed packing, much more safe to use. 7 update the toothbrush heads every single 3 months 8 you've any questions about the toothbrush model, you can seek the advice of visitor service. Thank you sealed packing