IRCT2016111230858N1 IRCT 2017-03-23 Vice Chancellor for research of Yazd University of Medical Sciences effect of laser and Propolis in treatment of dentin hypersensitivity Clinical trial of comparison between Nd:YAG laser and Propolis in treatment of dental sensitivity in patients with dentin hypersensitivity 2016-03-19 anticipated 25 Complete https://irct.ir/trial/24400 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Other design features: Randomization is done using random numbers table to determine the kind of treatment in right or left side of patients' mouth. Therefore some patients receive laser treatment in right and Propolis gel in left side, and other patients receive conversely treatment. Because of one type treatment on right sensitive teeth and one other type on left sensitive teeth in each patient, this design study is called split mouth. 3 dentin hypersensitivity. Intervention 1: laser radiation in cervical area of sensitive teeth in three sessions with one week intervals. Nd:YAG laser with 1064 nanometer wavelength, 1W power, 10 Hz frequency, short pulse mode, 300μm fiber tip was used for a time of 60 sec on each tooth. Intervention 2: 40% Propolis gel applying in cervical area of sensitive teeth in three sessions with one week interval.