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Since decades, irrigants have been delivered into root canal space using syringes and metal needles of different sizes and tip design. Clinical researches have shown that classic approach of irrigant delivery results in ineffective irrigation in areas like anastomoses between canals, fins and most apical part of the main root canal. Therefore, technological advances have brought new agitation devices that rely on various mechanisms of irrigant transfer, soft tissue debridement and removal of smear layer through manual and machine assisted agitation systems. Overall review has been concluded...