This session will provide an overview of the operational theory of pneumatically controlled dental delivery systems and the key components that support their performance. Attendees will learn how to identify, troubleshoot, and repair the most common system failures encountered in the field. The presentation will also review recommended preventive maintenance practices, including daily, weekly, and monthly tasks that should be performed by end users to ensure reliability and extend equipment life. Practical troubleshooting techniques and maintenance best practices will be discussed throughout the session.