Early dentin caries under intact enamel surface Body of the lesion(病损体部) Dead tract(死区) o Reparative dentin Tertiary dentine Department of Oral Pathology, Shandong University http://1.51.214.13Department of Oral Pathology, Shandong University 7 http://1.51.214.13  Body of the lesion (病损体部)  Dead tract (死区)  Reparative dentin (Tertiary dentine)