Table 2.

Smear layer evaluation criteria.¹⁸

Score	Description
1	There is no smear layer, and all of the dentinal tubules are exposed.
2	Some dentinal tubules and a little bit of smear layer are open.
3	Only a few dentinal tubules are exposed due to a homogeneous smear film covering the root canal wall.
4	The complete root canal wall is covered by a homogeneous smear layer and there are no open dentinal tubules.
5	A heavy homogeneous smear layer is covering the complete root canal wall