Objective: To discuss and analyze the common causes of dental unit failures and summarize maintenance experiences. Methods: The failures were studied through retrospective analysis in our dental clinic from January 2019 to December 2019. Causes for four common failures were analyzed deeply, and the corresponding improvement solution was implemented. Results: These solutions reduced the failure rate for dental units and improved understanding of the importance of using and maintaining the equipment correctly.Conclusion: Analysing and improving proper maintenance can save costs for the hospital and effectively enhance the management level of medical equipment maintenance.