Radiography is the most frequently used supporting examinations in the medical field, especially in dentistry. The use of radiography is important for establishing a diagnosis and further treatment. This radiographic imaging technique can produces radiation that can cause both ionizing and non-ionizing effects. Ionizing effects are divided into two, stochastic effects and deterministic effects, these effects can cause biological damage. These effects need to be known pre-clinical and clinical

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... udents as an act to prevention. Objective: To compare the level of knowledge of pre-clinical and clinical students regarding the dangers of radiation exposure at RSGM-P Universitas Trisakti. Methods: Respondents in this study were 100 pre-clinical and clinical students consisting of 50 pre-clinical students who had taken module 412 (Supporting Examination for Diagnostics) and 50 clinical students at RSGM-P Universitas Trisakti using a questionnaire by distributing via the google link forms. Results: The Mann-Whitney test showed a significant difference in knowledge of the dangers of radiation exposure between pre-clinical students 45.3% and the clinic students 54.7%. Conclusion: There is a difference in the level of knowledge between pre-clinical and clinical students at RSGM-P Universitas Trisakti regarding the dangers of radiation exposure.