IRCT20120215009014N418 IRCT 2022-03-08 Hamedan University of Medical Sciences Effect of injection site precooling versus benzocaine gel on pain perception during infiltration local anesthesia of anterior teeth in children Effect of injection site precooling versus benzocaine gel on pain perception during infiltration local anesthesia of anterior teeth in children: a randomized clinical trial 2022-04-04 anticipated 52 Complete https://irct.ir/trial/62175 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The patients will be randomly assigned to intervention and control groups using block randomization. For this purpose, we will prepare two envelopes, writing in one envelopes the name of the intervention and in another the name of the control. The envelopes will be randomly drawn one at a time for each patient without replacement. This action repeated until the sample size is reached. 3 Pain. Intervention 1: Intervention group: Put ice on the injection site for one minute. Intervention 2: Control group: Apply benzocaine gel to the injection site for one minute. 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 It depends on the situation and the results of the study as well as the approval of the financial supporting organization.