Cementum is a specialized calcified avascular mesenchymal tissue that form the outer covering of the anatomic root. The term „cementum‟ is derived from the Latin word “caementum” which means the quarried stone. Cementum may undergo alterations in structure as well as in the composition of its organic and inorganic components consequential to pathological changes in the immediate environment. Hypermineralization: the cementum of periodontally involved teeth,and in particular the hypermineralized surface zone, is also charecterized by an increased fluoride content. The high fluoride content of the surface layer also contributes to the subsurface and undermining character of the demineralization process in the cementum caries. Moreover, translocation of mineral ions during the caries process may result in the development of a more densely mineralized surface zone in the early cementum caries lesion than in the adjacent exposed, noncarious cementum surface
Keywords:: Cementum, Hypermineralization regeneration, rootcaries, repair.