Table 1: Stages of evolution according to the classification of carious cervical lesions.
|Stage 0||Colored cemento-dentin surface and more or less eroded.|
|Stage 1||Superficial cavitation which concerns the external third of the dentine, the amelo-dentinal junction is spared.|
|Stage 2||Cavitation of the middle third of the dentine, it extends in an apical and proximal direction.|
|Stage 3||Distinct cavitation of the internal third of the dentine, it extends towards the proximal surfaces.|
|Stage 4||Deep cavitation, creeping, extending all the way around the root canal. There is a risk of coronal fracture.|