There are two features we rate when it comes to electric toothbrushes: brushing timers and pressure sensors. Brushes with a timer will signal after every 30 seconds of brushing; the idea being that you spend 30 seconds on each quarter of your mouth, giving a dentist-recommended two minutes in total. A pressure sensor will alert you when you're pressing too hard on the brush, which could damage your gums and enamel. Many premium electric toothbrushes now come with a 'smart' connection to your phone, we have yet to be impressed by these features and think it can be ignored.