The carious lesion is not visible under white light.

The fluorescence image shows a demineralization on the marginal mesial ridge compared to the opposite ridge.

The radiography confirms the presence of the carious lesion of stage 3.

Under white light, the entry point of the caries and the cavity can be seen.

The fluorescence image shows the demineralized enamel, the destructured and the infected dentine.

At the end of the preparation, the fluorescence image shows the all the infected dentine was removed.