Drain is aneffective tool in the major maxillofacial surgeries that is used to decrease postsurgical complications. This research evaluated it's efficacy of in mandibular impacted tooth surgery. Primary wound closure (Test group) was compared to a simple primary wound clousure (Control group) after removal of impaced mandibular third molars for evaluation of its effect on Postsurgical complications. Surgery was performed on 12 patients in cross over fashion. Both surguries in both sides were done in on session. There wasn't any significant difference in the operation time between two groups. Facial swelling was found to be significantly less in the test group. Sex differences in the bleeding. wound bread down and echymosis between the tow groups. There were no differences in the severity of pain and infection between the two groups. According to our findings, using of this tool in surgeries with high trauma was advocated for decreasing swelling rate and for patients, Comfort.