The aims of orthodontic treatment is to improve the function of mastication, phonetics and aesthetics. Orthodontic treatment in Islam is not permitted if the purpose of treatment is only to improve aesthetics. Islam emphasizes hygiene and health, so orthodontic treatment with the aim of correcting mastication and phonetics accompanied by aesthetics is permissible. The purpose of this study was to determine the description of knowledge on orthodontic treatment in Islam at the lecturer at the Faculty of Islamic Studies, University of Muhammadiyah Yogyakarta. The method of this study was descriptive observational, with a total sample of 46 lecturers. Sample inclusion criteria are lecturers who actively teach at the Faculty of Islamic Studies at the University of Muhammadiyah Yogyakarta, namely all lecturers in the departments of Islamic Education, Islamic Economics, and Islamic Broadcasting Communication. The sample exclusion criteria were the Lecturers of the Faculty of Islamic Studies of the University of Muhammadiyah Yogyakarta who were continuing their studies abroad or other universities, and lecturers who were not willing to become research respondents. The results of the questionnaire were analyzed using descriptive statistical analysis which is frequency distribution, so that it would be known that the trend of research results included in the categories of low, medium or high The results showed that the level of knowledge of orthodontic treatment according to Islam had a good level of knowledge with a percentage of 78,3%. The conclusion of this study is that lecturers are highly knowledgeable about orthodontic treatment according to Islam. The majority of lecturers know that orthodontic treatment in Islam is permissible with health goals, whereas if the goal of treatment is to improve aesthetics and change the form of Allah Subhanahu wa Ta'ala creation it is not permissible