If a manual toothbrush is used for the appropriate amount of time, and done with proper technique, it can perform just as well as a powered toothbrush. But many people don’t brush for the recommended two to three minutes. Children are also good candidates for powered brushes as their brushing habits tend to be less than optimal.
While everyone certainly does not need an electric toothbrush, in many instances they can be beneficial. Ask your dentist if you have any questions about which brush is best for you.