This overall score is made up of ease of use (60%), ease of cleaning and reaching the front teeth (10%), ease of cleaning and reaching the back teeth (10%), ease of cleaning and reaching the side teeth (10%) and feel against gums (10%).

The ease of use score is made up of how easy the toothbrush is to manoeuvre, how comfortable the toothbrush is to grip, how easy it is to understand the controls and how easy it is to attach the cleaning head. 

We recommend electric toothbrushes that score at least 75% overall.

'Tested model' means you ought to be able to find this in stores.

This is the recommended retail price.

This is the recommended retail price as of April 2017.

Brushes that don't allow you to change the head will mean you have to replace the entire unit up to four times a year.

The number of replacement heads included in the pack with the toothbrush.

This shows you when you should recharge your toothbrush.

A timer will either indicate when to move the brush to a different part of your mouth, or when you have passed the recommended two-minute clean.