Which among the following is the best irrigant for the removal of the smear layer:: (A) H2O2, (B) NaOCl., (C) H2O2+NaOCl., (D) EDTA.
Answer is C. H2O2 + NaOCl (best for removal of smear layer). 
NaOCl should be used last to avoid surgical emphysema caused by H2O2