B Background: Running a profession, dentists need to establish a partnership with dental suppliers. Dentists require dental suppliers in terms of information science and technology, while dental suppliers require dentists as consumers. Should be the relationship, dentists and dental suppliers not to take the freedom away of the dental profession, however, cooperative relations have often been misused. As a soon to be dentists, Preclinical Dentistry Trisakti University students are required to have a certain level of knowledge about the ethical aspects relationship dentists and dental suppliers. Objective: To determine the level of knowledge of dental students of Trisakti University concerning ethical aspects of the relationship of dentists and dental suppliers. Method: This observational descriptive study is using a cross-sectional design. Data was obtained using questionnaires that were given to 97 respondents who are pre-clinical dental students of Trisakti University class 2015/2016. Result: From the average data obtained from 97 respondents, showed that overall of the respondents answered the questionnaire with an 80% rate of success (18 of 20 statement answered according to its original meaning). Conclusion: Trisakti University students have high knowledge level about ethical aspects of the relationship of dentists and dental suppliers.