Medium-Soft bristle brush head.Medium-soft, end-rounded, DuPont nylon bristles.
Timed sonic vibrating motor
Vibrates bristles at strong 38,000 motions per minute for effective yet sensitive cleaning action. The timer pulses every 30 seconds as a reminding to change the brushing area, and automatically stops at 2 minutes. Rechargeable (via USB) toothbrush lasts 4 weeks.