DIAGNOdentPit and fissure cavities on the biting surfaces of teeth can easily hide in the deep grooves and crevices. The DIAGNOdent machine is a cavity detection device that uses laser fluorescence to record changes in tooth structure caused by decay.  It can detect cavities early before visual changes are clearly evident. Detecting and treating cavities in the beginning stages of development saves a considerable amount of natural tooth structure.