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Caries According to the depth of the lesion (X-ray classification)
E1 enamel caries - the outer half of the enamel is affected
E2 enamel caries - the entire enamel layer is affected
Dentine caries D1 - the outer third of the dentin is affected (superficial dentin caries)
Dentine caries D2 - the middle third of the dentin is affected (medium caries)
Dentine caries D3 - the inner third of the dentin is affected (deep caries)