Favorable outcome of non surgical endodontic retreatment depends on the complete elimination of the microflora from the root canal system. But the conventional chemo-mechanical cleaning and shaping (i.e; using file system and irrigants) may not be successful enough to eliminate the flora and therefore needs the addition of suitable intracanal medicament along with the conventional cleaning and shaping. The most commonly used Intracanal medicament is Calcium hydroxide, which is been used from a long time. But, Calcium hydroxide has several drawbacks such as: The high pH (11 to 12) might be toxic to the periapical gem cells, Inability/ resistance of many microorganisms against calcium hydroxide etc. Therefore, this necessitates the need for a better and more efficient intracanal medicament during retreatment procedures. The proposed study is an interventional study which will be done to evaluate and compare the level of  bacterial reduction between 2 intracanal medicaments: 2% Chlorhexidine gel and modified triple antibiotic paste during non surgical endodontic retreatment. 26 participants will be divided randomly into 2 study groups: group I will be getting 2% Chlorhexidine gel as the Intracanal medicament and group II will be getting freshly prepared modified triple antibiotic paste. Three samples from each participants will be collected during various stages of the retreatment procedure and sent for colony count calculation and evaluating the reduction in bacterial count.