This work was done in view to rejuvenate the ancient and potent medicament , calcium hydroxide to a latest formulation. Calcium hydroxide was used in the paste form till date where as in this work it has been used as calcium hydroxide irrigation and the effect on the tooth fracture strength has been evaluated. As we know that calcium hydroxide was introduced to Dentistry by Herman at the beginning of the 20th century and since then, has gripped endodontics in a wide array of uses. In its pure form calcium hydroxide has a high pH and has various biologic properties that has prompted its use in several clinical situations..It has become established as the most frequently used endodontic intracanal medicament owing to its good antimicrobial properties against the vast majority of endodontically relavent pathogens and its good bio compatibility . Its use is recommended in endodontic treatment of infected root canals or when single visit treatment is not feasible. Optimal duration of medication has been proposed to be 1-4 weeks.a comprehensive knowledge can be acquired about the short and long term effects of calcium hydroxide.