Innovative Dental Device Helps to see Invisible Tooth Decay and Plaque. Improving dental care though improving technology. A team of scientists from the University of Liverpool has won an award for developing a device that can identify early tooth decay and plaque before it is visible to the human eye. The innovation, “iDentifi” comprises a clinical digital camera which incorporates qualitative light induced fluorescence technology to take images of the mouth using blue light and special filters which can show up cavities and plaque.