The tiny squares successfully sent wireless signals to tablets and cell phone devices. In one of their first experiments, the chip could tell the difference between solutions of purified water, artificial saliva, 50 percent alcohol and wood alcohol. It would then wirelessly signal to a nearby receiver via radiofrequency, similar to how EZ Passes work. They demonstrated that different concentrations of glucose, a type of sugar, could be distinguished, even in liquids that had sugar concentrations like those found in fruit drinks.
Researchers at Tufts University are testing tooth-mounted RFID chips which sense and transmit data on what goes in your mouth. ABC News reports: The sensors looks like custom microchips stuck to the tooth. They are flexible, tiny squares — ranging from 4 mm by 4 mm to an even smaller size of about 2 mm by 2 mm — that are applied directly to human teeth. Each one has three active layers made of titanium and gold, with a middle layer of either silk fibers or water-based gels. In small-scale studies, four human volunteers wore sensors, which had silk as the middle “detector” layer, on their teeth and swished liquids around in their mouths to see if the sensors would function. The researchers were testing for sugar and for alcohol.