The slim handle of the Smart 4 - 4100S electric toothbrush enhances your brushing habits. You optimize your brushing routine, and the unique round head from Oral-B takes care of the rest. The toothbrush removes up to 100% more plaque than a regular manual toothbrush, leading to healthier gums and brightening your smile from the very first day of use by removing surface stains. Additionally, the toothbrush protects your sensitive gums with pressure sensor technology that reduces brushing speed and alerts you when you are brushing too hard. With Smart Coaching, you can improve your brushing habits and oral health. Compatible with the following replacement brush heads: Cross Action, 3D White, Sensi UltraThin, Sensitive Clean, Precision Clean, Floss Action, Tri Zone, Dual Clean, Power Tip, Ortho Care.