Fig. (1) Scales for the caries detection devices employed in this study. A) The DIAGNOdent Scale developed by Lussi et al. (2001) for detection of occlusal caries lesions. B) The Canary Scale. The Canary Scale is a relative scale of 0 - 100 that reflects the state of tooth mineralization and crystallization. This is a graduated scale where lower numbers indicate sound enamel and higher numbers indicate more advanced tooth decay. SPECTRA.