 The purpose of the present investigation is to evaluate the effectiveness of the preoperative administration of Dexketoprofen Trometamol, employing the third molar surgery model, when compared to postoperative administration of the same drug. It was hypothesized that preoperative oral Dexketoprofen trometamol will reduce the intensity of pain by 30 after 8 hours of the surgery, when compared with post-operative administration. 