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The DIAGNOdent is an accurate and reliable adjunct for the detection of sub-surface caries. It removes the guesswork that accompanies many treatment decisions regarding questionable areas, such as stained or discolored grooves. The DIAGNOdent uses laser technology to detect and quantify hidden or sub-surface caries by measuring laser fluorescence within the tooth structure. The device operates at a wavelength of 655 nm. The DIAGNOdent will react with elevated scale readings on the display. An audio tone allows the operator to hear changes in the scale values. This enables the user to focus on the patient, not solely on the device.