The 2mm x 2mm devices are made up of a film of polymers that detects chemicals in its environment.
Sandwiched between two square-shaped gold rings that act as antennas, the sensor can transmit information on what's being chewed on in our mouth to a digital device, such as a smartphone.
The type of compound the inner layer detects determines the spectrum and intensity of the radiofrequency waves that the sensor transmits.
Because the sensor uses the ambient radio-frequency signals that are already around us, it doesn't need a power supply.
The researchers tested their invention on people drinking alcohol, gargling mouthwash, or eating soup.
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