If you have limited dexterity, a powered toothbrush may be a better
option since it largely does all the work for you.
Kids enjoy the fun of powered toothbrushes, especially decorated with
their favourite characters. They can also be programmed to run for
two minutes, taking out the guesswork for kids and adults alike over
brushing time.
The position of the powered toothbrush should be the same as with
a manual toothbrush, at 45° at the gum line. The big advantage of
powered toothbrushes is that their oscillating-rotating heads supply
all the movement. All you need to do is guide the brush slowly from
tooth to tooth, stopping for a few seconds on each one, systematically
following the contours of the teeth and the curve of your gums.

If your unsure about which powered toothbrush then consult your Dentist