The pain is the primary reason for which most of the patients seek endodontic treatment frequently. Endodontic procedures play an important role in restoring and treating a tooth which is affected irreversibly by bacterial invasion and infection. It usually aims in the complete debridement of inflamed and necrotic pulp tissue from the root canal space and sealing it from the external environment. There is an effective relief in pain, preceding an appropriate and flawless endodontic procedure. However, the relief in the pain levels, may not be immediate and absolute. Although it is diminished to some extent, immediately following the root canal treatment in most of the patients, 30% of them still experience moderate to severe postoperative pain due to the residual effects of inflammation.So an endodontic procedure should consider both primary concerns of the patient and long term complications such as postoperative pain. Pain is usually at its worst in the first 24 hours postoperatively after an orthograde endodontic procedure and gradually the levels decrease in the subsequent 3 to 7 days 

Mechanical, thermal, chemical and immunological stimulation of afferent nociceptors, which synapse in the dorsal horn of spinal cord lead to direct sensation of thalamus and presents as pulpal and periapical pain The stimulation of nociceptors is prevalently by the endogenous inflammatory mediators such as bradykinin, calcitonin-gene related peptide, substance p, growth factors, cytokines, chemokines and arachidonic acid.These are generated as part of innate immune response following a tissue injury or destruction. Arachidonic acid metabolite is converted to prostaglandin by enzymes such as cyclooxygenase enzyme 1 and 2 (COX-1, COX-2). The converted prostaglandins in turn cause the sensitization of afferent nociceptors leading to decreased pain threshold . Therefore pharmacologic interventions mainly aim in targeting cyclooxygenases thereby limiting the prostaglandin production and limiting the sensitization of nerve fibres .

Perception of pain is highly subjective and variable experience. It is not only influenced by the treatment procedure being performed but multiple physical and psychological factors also play a role in perceiving pain. Conventional dental procedures are associated with pain postoperatively, but the incidence and severity is highest with root canal therapy. The main contributing reason for postoperative endodontic pain is because of the extrusion of canal contents, debris and microbes from root canal space to periapical area, leading to intense inflammatory response and infection. Various non-narcotic analgesics like NSAID`S are majorly used in treating the endodontic pain. The mechanism of action is mainly by inhibiting prostaglandin synthesis at the sites of inflammation. Several clinical studies have evaluated the use of NSAID`S for treating the postoperative pain in endodontics with conflicting results. Some studies state conclude the beneficial effect in administration of non-narcotic analgesics whereas others claim no efficient results(10),(11). Various other drugs that are used along with NSAID`S include opioids and combination of drugs for treating endodontic pain.

In many studies, the drugs were prescribed preoperatively and postoperatively to reduce the endodontic pain showed conflicting results. Pre-emptive analgesia is an anti-nociceptive treatment which amplifies the postoperative pain by preventing the processing of altered afferent input. As most of the patients presents with pain pre-operatively, have higher levels of inflammatory mediators being released. Thus, pre-treatment analgesia decreases the establishment of central sensitization, a mechanism by which spinal neurons increase their response to peripheral nociceptive impulse.

 Therefore the aim of this study to cocompare and evaluate the postoperative pain levels and analgesic intake on preoperative oral administration of NSAIDs in single visit root canal treatment.