IRCT20190220042779N1 IRCT 2019-06-04 Tehran University of Medical Sciences The study of music impact on children`s cooperation The study of music impact on children`s cooperation during the dentistry operations : Based on the 2nd and 3rd initial Franckle behavioural 2019-04-24 anticipated 44 Complete https://irct.ir/trial/37771 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive, Randomization description: In this study, a simple randomization method in which there is a single sequence of random allocations, has been used. Individual randomization unit is used to randomize random number tables and non-transparent envelopes are used for concealment. N/A Restorative treatment or dental pulpotomy on primary molar. Intervention 1: Intervention group: 4-8 year-old children who need dental treatment that undergoes treatment on one side of the lower jaw along with music playback through headphones. Intervention 2: Control group: 4-8 year-old children who need dental treatment that undergoes treatment on the other side of the lower jaw without music playback. 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 The Data distribution method is unknown.