A dental implement is presented including a body portion, at least one oscillator (210), and at least one light source (220) driven by the at least one oscillator and configured to emit at least one excitation light having a plurality of components modulated at a plurality of frequencies. The dental implement further includes at least one optical unit for removing reflected excitation light and receiving a fluorescence light beam from the teeth, and a detector (270) configured to receive the fluorescence light beam for detecting plaque and communicating plaque identification information of the teeth based on frequency domain lifetime measurements.
