Does anyone really need a £340 electric toothbrush when one costing £6 will do the same job?

Artificial intelligence that can predict your every move, high-tech sensors, flashing coloured lights and an in-built charger. No, this isn't the latest sports car dreamed up by Silicon Valley wizards. It's the latest all-singing, all-dancing electric toothbrush – the Oral-B Genius X – which uses the same technology as that behind driverless vehicles and robots that diagnose diseases. The gadget can give users a new insight into their brushing habits, even down to the pressure applied on each tooth, makers claim. Oh, and it costs an eye-watering £340. Some might say it's a price worth paying for an impeccable Hollywood smile.