IRCT20220221054086N1 IRCT 2022-03-04 Tehran University of Medical Sciences Evaluation of the effect of educational interventions on prevention of oral cancer based on the behavior change model Evaluation of the effect of educational interventions on preventive behaviors of oral cancer based on the Theory of Planned Behavior among people aged 15 years and more: A cluster randomized controlled trial 2022-04-21 anticipated 400 Complete https://irct.ir/trial/62120 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Randomization description: This study will be performed using simple cluster random sampling. Based on the socio-economic development index, the city of Tehran is divided into five areas of advantaged, relatively-advantaged, semi-advantaged, low-advantaged, and very low-advantaged. The city of Tehran has 22 districts, of which the advantaged area includes four districts (1, 2, 3, 6), the relatively-advantaged area includes two districts (5, 7), the semi-advantaged area includes six districts (4, 8, 11, 13, 21, 22), the low-advantaged area includes five districts (9, 10, 12, 14, 20), and the very low-advantaged area includes five districts (15, 16, 17, 18, 19). Two areas of low- and very low-advantaged will be selected according to the research goal. Then, the list of health centers in these two areas will be extracted based on their locations in the districts covered by Tehran University of Medical Sciences, including districts 10, 15, 16, 17, and 19, which include 100 centers. Next, among the health centers located in these districts, the centers which have capability to implement study better will be selected based on the criteria such as activeness of the center, cooperation of the center, sufficient number of clients, amount of participation of covered people, and facilities of the center including appropriate space and place for education. The list of selected health centers that are considered as clusters will be prepared, and from these selected centers, 20 centers will be randomly selected, of which 10 centers will be allocated to intervention group 1 (control) and 10 centers to intervention group 2 by simple randomization using Excel software. Then, according to the sample size of 400 people, in each of the 20 health centers, 20 people will be selected, in such a way that the list of people covered by these centers will be prepared, and 20 of them will be selected by simple random sampling and invited to participate in the study, and if people do not have willing to participate in the study, alternative people from the prepared list will be also selected by simple random sampling, Blinding description: The data will be entered into STATA software with special codes, so that the analyzer is not informed about the clusters and groups. N/A Prevention of oral cancer. Intervention 1: Control group: Education on oral cancer prevention by educated health volunteers using two sessions of 10-15 minutes lecture presentation in form of PowerPoint slides, and presentation of pamphlet based on the structures of the Theory of Planned Behavior, with interactive group discussions, and questions and answers to questions. Intervention 2: Intervention group: Education on oral cancer prevention by educated health volunteers using information presentation on smartphone in form of educational and motivational messages, pictures, and videos in WhatsApp groups based on the structures of the Theory of Planned Behavior, with interactive group discussions, and questions and answers to questions. 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 There is no more information