MouthPad lets your tongue control a computer

Computer mice have taken plenty of unusual forms over the years. Now, one of the most interesting alternatives skips your hands altogether.

San Francisco-based Augmental Technologies has developed the MouthPad, a custom-fit touchpad that sits inside your mouth and lets you control a computer, smartphone or tablet using your tongue or head. The company describes it as the world's first hands-free touchpad.

It looks a little like a slim dental retainer. However, tucked inside is technology...