Although the type of electric toothbrush you choose is primarily up to your personal preference, there are a couple of features most dentists recommend..
A Small Head
Electric toothbrushes with a small head provide greater maneuverability and better access to tighter spaces that a larger head would not be able to reach. They make it easier for you to reach those tight spaces in the back of you mouth, and behind your front teeth.
A Round, Rotating Head
Electric toothbrushes featuring round, rotating heads mimic the ideal circular brushing motion recommended by dentists. This means you can just move the toothbrush over your teeth and the toothbrush will make the circular motions for you.
A Built-In Timer
Some brands of electric toothbrushes come equipped with a built-in timer that goes off after two minutes, which is the recommended length of time you should be brushing your teeth. Built-in timers take the guess work out of brushing. They tell you exactly how long to brush. You might be surprised, two minutes feels longer than you might think!
Some electric toothbrushes have other helpful features, depending on your needs. Some have a pressure sensor, which can be useful for those who have sensitive gums, or tend to brush too hard.
Several models feature timers that go off every 30 seconds, so that you know how long to brush each quadrant of your mouth.