They make people look like they’ve been chewing on glow sticks, but the LED smiles created by designers Motoi Ishibashi and Daito Manabe are the new rage in Japan.

Originally created as an experiment, the LED smile is currently used in a commercial for the winter sale of a popular Japanese clothing store, and are quickly becoming one of the most sought-after fashion accessories in Japan. LED smiles are easily fixed to one’s teeth and glow different colors when you smile. Best used in the dark, these unusual gadgets change color wirelessy, through a computer interface.

Although LED smiles aren’t yet available for purchase, Ishibashi and Manabe are currently offering workshops across Japan, teaching people how to create their own.