PS:Suitable for SOOCAS X1/X3/X3U/X5 Features: 1. Soft DuPont bristles, appropriate for touchy teeth to apply 2. Ultrasonic electric toothbrush can effectively eradicate plaque and reduce gingival necrosis. 3. Adopt DuPont American tynex basic zero bristles bristles,gently on your teeth. four bristle tip diameter, deep clean the distance between teeth 5 approved through approach of FDA and UV sterilized. 6 sealed packing, way more safe to use. 7 update the toothbrush heads every 3 months eight you have any questions about the toothbrush model, you may search the advice of shopper service. Thank you. Indenpently sealed packing