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)