IRCT20171020036896N7 IRCT 2018-12-21 Kerman University of Medical Sciences the effect of methanolic extracts of green tea and chlorhexidine gel on postoperative pain control Comparative assessment of the effect of methanolic extracts of green tea and chlorhexidine gel on postoperative pain control following surgical removal of impacted third molars 2018-12-11 anticipated 30 Complete https://irct.ir/trial/35695 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive, Randomization description: Simple randomization or unrestricted method will be used and randomization unit is Individual .we will use from Roll of a die from the methods of simple randomization because there are 2 agent in this study that actually the tool of randomization is dice. So the numbers 1 and 2 are for the first agent(chlorhexidine) 3 and 4 for the second agent (green tea) . The next step Allocation concealment will be done, In such a way that the allocated group is not known before the assignment of the individual. To achieve this goal, a non-transparent, sealed, random sequence envelope is used . In this way, the statistical specialist will provide 30envelopes and each of the randomly generated links will be recorded on a card and the cards are arranged in the envelopes . In order to maintain a random sequence, the numbering of envelopes on the outer surface is done in the same order. Finally, the envelops are enclosed and placed in the box, respectively. At the time of the implementation of the study, according to the order of entry of eligible participants, one of the envelopes is opened respectively and will determine the group assigned to that participant. In this study, the assistant of Pediatric Dentistry examines the participants in terms of inclusion and exclusion criteria. Randomization methods are done by an statistical specialist and performance of the study is done by a trained dental student, Blinding description: Because all two materials are in the same consistency gel, in a uniform shape and color, considering the informed consent, participants are unaware of material. Data analyzer, is also unaware of the groups. N/A The level of postoperative pain of impacted third molar. Intervention 1: Intervention group: The two cc methanolic extract of green tea 20 % is applied twice a day for one week after surgery of the impacted wisdom teeth by the patient on the surgical site. Intervention 2: Control group: The two cc chlorhexidine 2 % is applied twice a day for one week after surgery of the impacted wisdom teeth by the patient on the surgical site. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is Because the study data apart from analyzing, do not have any other scientific application.