[from Ananova]
A new hi-tech toothbrush has been launched with built-in "satnav".
Maker Oral B claim that as you clean your teeth it transmits information by radio to a separate miniature display screen, telling you where you should clean.
It also tells you how long you should brush for and if you're brushing too hard or not hard enough, reports the Daily Mail.
The manufacturers are hoping their new gizmo - called Triumph with SmartGuide - is going to be this year's Christmas must-have in the bathroom.
It comes with a wireless LCD display which can be stuck on to the shaving mirror.
Oral B says its research suggests that people using the device are four times more likely to spend two minutes per clean than if using a manual brush.
The firm's dental expert Dr Surinder Hundle said: "We are dedicated to helping improve the way people care for their teeth and gums and taking a lot of the guesswork out of brushing.
"Triumph with SmartGuide does just that, guiding the user in real time to help improve his or her brushing habits."
The Triumph is on sale nationwide from next month and will be back with a big advertising campaign in the months running up to Christmas.