How to diagnose cavities: Cavity identification and removal in two molars. Photo Image #'s 1, 3, 5 and 7 show the first molar; Image #'s 2, 4, 6 and 8 show the second molar. Image #'s 1 and 2 show the initial cavities. Image #'s 3 - 8 show progression in the still incomplete cavity removal in both teeth. For the second molar note how the decalcification and decay spread laterally from the buccal surface all the way into the mesial box in image #'s 2, 4, 6 and 8.