I found the man with the brightest smile at E3 roaming Kentia Hall in the closing hour of E3. "Mr. Silver" told me he sells patented mouth lights and bodypaint on his website, but I don't see a link, so you'll have to email him if you really want to show off your tartar control. He claims he can eat and drink without difficulty or risk of electrocution. Of course, there's also a medical model for serious dental applications.
