Dentin formation is not a continuous process, the periods of rest are denoted by incremental lines
Like other mineralized tissues dentin formation is not a continuous process, the periods of rest are denoted by incremental lines—the incremental lines of Von Ebner which are 4–8 mm apart run at right angles to the dentinal tubules.
Lines of Von Ebner
Lines of Owen
Neonatal lines
All of the above