Tonge Touch or [in]brace
As part of her Masters Thesis Dorothee Clasen has created an oral wearable that connects the movement from your tongue to machine code. When you place the device in your mouth you are able to move a small magnetic element back and forth with your tongue, this in turn connects to a wifi module behind your ear and transfers the data to connected devices such as IoT / Smart home or Gaming consoles.
With the increase in Haptic interfaces it was only a matter of time before someone looked into developing something for your mouth.
I one side I can see the beauty in this creation from an innovation point of view, but i am still not sure what or why you would use this in the real world.