Background: Smear layer is a debris consisting of organ ie and inorganic particles of calcified tissue, necrotic tissue, pulp tissue, and dentinoblast and microorganism processes th at can close the entrance to the dentin tubuli. Smear layer, will not only inhibit the penetration of disinfectiori materials and sealas to the dentin tubuli, but will also reduce the attachment of root canai fillin…