Dr. Hazelbaker authored the Assessment Tool for Lingual Frenulum Function (ATLFF) during her Master’s program. Her research on assessment and screening for tongue-tie has set a worldwide standard and forms the basis for many of the other proposed and yet-to-be researched assessment processes. The ATLFF remains the only research-based tongue-tie screening and assessment tool for infants under 3 months of age. In this presentation, Dr. Hazelbaker uses multiple video segments to illustrate the proper use of the ATLFF and provides practice time with guidance in longer versions of this presentation. Participants come away with a better understanding of the ATLFF and its application in clincial settings.