Electric toothbrush bristles vibrate or rotate to help you remove plaque buildup from your teeth and gums. The vibration allows for more micro-movements every time you move your toothbrush across your teeth.

More effective at removing plaque

A review of studies showed that, in general, electric toothbrushes do decrease more plaque and gingivitis than manual toothbrushes. After three months of use, plaque was reduced by 21 percent and gingivitis by 11 percent. Oscillating (rotating) toothbrushes seem to work better than just vibrating toothbrushes.

Easier for people with limited mobility

Electric toothbrushes does most of the work for you. They may be helpful for anyone with limited mobility, such as people with:

• carpal tunnel
• arthritis
• developmental disabilities

Source: healthline