Legal scope of practice (SOP), based on state-specific practice acts, defines what services a health professional is allowed to provide and under what conditions in a given state. This webinar considers state-to-state variability in dental hygiene (DH) SOP. The presenter describes the use of the Dental Hygiene Professional Practice Index to quantify SOP and highlight differences across states. Research on the impact of DH SOP on access to community based oral health preventive services is also discussed.