Haapasalo developed a new irrigant, QMix,6 which has substantial antimicrobial properties and is also effective in eliminating the smear layer.7It is a mixture of 2% chlorhexidine (a bisbiguanide, antimicrobial agent), 17% EDTA (a polyaminocarboxylic acid calcium-chelating agent) and cetrimide in distilled water with acceptable additional salt.6