Objective: To conduct a systematic review of COVID-19 related biosafety guidelines for dental clinical practice in early pandemic, focusing on quality assessment. Material and methods: Electronic (via PubMed, Scopus, Web of Science, Latin American and Caribbean Health Sciences Literature database, Brazilian Library in Dentistry, and Cochrane Library) and gray literature searches were performed for documents published up to May 12, 2020. Dates of the included guidelines updated to April 17, 2021 have been identified. Documents were included as guidelines if they met the following criteria: i) consisted of a set of statements, directions, or principles presenting current or future rules or policy; ii) were developed by government agencies, institutions, organizations, or expert panels; iii) were related to general conduct of health care activities rather than for a particular condition. Two researchers, using the Appraisal of Guidelines for Research & Evaluation II (AGREE II), independently extracted the recommendations and evaluated the quality of the guidelines. Results: Twenty-seven documents, from 19 countries, were included in the review, and resulted in 122 recommendations related to: I) professional biosafety; II) patients'/companions' safety; III) organization and biosafety of the physical dental facility environment, and IV) work process in dental care. Overall, the scientific quality of the guidelines was considered low. Some recommendations displayed in the guidelines would require further studies on their effectiveness. Conclusions: We found a wide variety of biosafety guidelines for dental practice regarding COVID-19 in the early months of the pandemic, but their quality is low. Biosafety recommendations should be frequently updated.