| Initial |
Absence of developmental ridges of the enamel, smooth glazed surface |
| Advanced |
| Facial/oral surfaces |
Concavities whose breadth greatly exceeds their depth |
| Lesion ovoid or crescentic in outline, concave in cross section or |
| Lesion entirely in the crown, irregular in outline, punched out appearance |
| Occlusal/incisal surfaces |
Surfaces appear flattened, depression of the cusps (cupping) and on the incisal edges (grooving), edges of restorations raising above the level of the adjacent tooth surface |
