Flexible DuPont Bristles - 3D dupont bristles is cleaned deeply between teeth. The top of bristle is rounded to care for sensitive gums. It is recommend to replace brush head every 3 months. 5 Mode Sonic Electric Toothbrushes: Sensitive, Clean, Whiten, Polish, Massage. Choose modes to suit your different oral care needs. Cleaning Mode for daily dental care and sensitive mode for fresh user or sensitive teeth. Up To 120 Days Of Use On A Single Charge: This adult electric toothbrush is designed for your convenience. It is fully charged in 3 hours for seamless 120-day performance, making the best travel toothbrush. Get More for Your Money: With our electric toothbrush, you'll receive 8 American DuPont brush heads that last for 24 months. Don't worry about buying brush heads frequently. Deeper Cleaning for Healthier Teeth: This electric toothbrush pushes the toothpaste to hard-to-reach areas with 40,000 vibrations per minute. 7 times better cleaning than with a manual toothbrush, removes almost 100% of dirt and bacteria and freshening the breath.