IRCT20190429043418N1 IRCT 2019-06-19 Tehran University of Medical Sciences Effect of low level laser on pain reduce of injection Effect of low level laser on pain reduce of infiltration injection 2019-06-22 anticipated 30 Complete https://irct.ir/trial/39162 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: Sampling in this study was done randomly from among eligible individuals and the choice of the desired position for laser irradiation and first injection of lidocaine was done randomly, Blinding description: In both steps and before injection, the head tube of the handpiece of the low-power laser device was placed in the apex of the upper canine tooth that was to be injected. Of course, only one laser radiation was activated in such a way that the subjects were not aware of radiation irradiation or laser irradiation. In both cases, visual measurement of pain using the visual analogue sampling method was performed by a person who, like the subjects, Radiation or non-radiation of the low-power laser was not known at the time of injection. N/A Pain of infiltration injection. Intervention 1: Intervention group : 30 teeth are exposed to laser irradiation and placed in the intervention group. Intervention 2: Control group : 30 teeth are not exposed to radiation and placed in the control group. 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 No more information