It is the live stream you never wanted to see but may find impossible to resist: rolling footage beamed live from inside your mouth while you are cleaning your teeth.
Dyson, the home appliance maker that made its name inventing bagless vacuums and bladeless fans, has turned its attention to oral hygiene with a £420 all-singing, all-dancing toothbrush that can clean, floss and even spray tiny jets of mouthwash.
