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Objectives: To evaluate the efficacy of a topical anesthetic gel containing potassium nitrate, benzocaine and tetracaine in patients undergoing non surgical periodontal therapy. Materials and Methods: The present study was a randomised, double blind, placebo controlled, split mouth design trial carried out in 300 patients. Two quadrants in each patient were selected for non surgical periodontal therapy. The drug gel and placebo were liberally applied over the teeth and gingiva on the selecteddoi:10.7126/cdj.2013.1759 fatcat:5defhg5omnhx7h732sjzy4ei3q