Cementoblasts produces cementum in a rhythmic manner on intervals indicating periods of activity and period of rests called INCREMENTAL LINES OF SALTER. Incremental lines of Salter are the only incremental line in the tooth that is hypercalcified, this is due to the fact that the organic portion(collagen fibers) is much more than the inorganic portion(hydroxy appetite crystals) of cementum, so when the Cementoblasts rest they leave a space for the inorganic portion. Unlike in enamel ameloblast(incremental lines of retzius) and dentin odontoblasts(incremental lines of von ebner) the inorganic portion is much more than the organic portion, so when ameloblast and odontoblasts rest they leave a space for the organic portion and become hypocalcified.