Despite the teething issues, Dyson’s Camerajet toothbrush packs in a lot of clever tech – but is it worth £420?

Dyson’s first electric toothbrush watches you brush and flosses for you, but there are far cheaper ways to get an effective clean• The best electric toothbrushes for every budgetWhen Dyson announced it was entering the toothbrush market, the world responded almost as one: “Four hundred and twenty pounds? For a toothbrush!?”No, it wasn’t a stray decimal point – or if…