PS:Suitable for SOOCAS X1/X3/X3U/X5 Features: 1. Soft DuPont bristles, appropriate for touchy tooth to apply 2. Ultrasonic electric toothbrush can efficiently remove plaque and decrease gingival necrosis. 3. Adopt DuPont American tynex traditional zero bristles bristles,gently in your teeth. 4 bristle tip diameter, deep clear the gap between tooth 5 accepted by way of means of FDA and UV sterilized. 6 sealed packing, way more safe to use. 7 replace the toothbrush heads each 3 months 8 you've any questions on the toothbrush model, you could seek the advice of visitor service. Thank you. Indenpently sealed packing