...I guess you could always put LED lights in your mouth.
It's not like we have anything better to do than report about it. And think how frightened Großmutter will be!
Developed by Japanese designers Motoi Ishibashi and Daito Manabe, the idea hatched when Ishibashi saw a video of LED throwies, little lights that can be fixed to a magnet and thrown onto metal surfaces, basically the gadget bastard of confetti and graffiti.
The LED smile devices affix easily to teeth and glow different colours when you smile. The colours can be changed wirelessly with a computer interface (as appears above).
They're now being used in ads for Laforet Harajuku's winter sale:
More importantly for the youth of tomorrow (and the misguided adults of today), Ishibashi and Manabe are providing workshops on how you - yes, you! - can make your own teeth smile a disconcerting ROYGBIV.
I conclude this with an instructional video involving Japanese schoolgirls, unfortunately titled "party in the mouth."