Development and Validation of a Spontaneous Smile Assay

What Is This Study About?

This study developed and validated a clinical assay for measuring smile spontaneity—the degree to which a patient’s smile occurs naturally in response to emotion rather than requiring conscious effort. The tool provides an objective way to assess one of the most important outcomes of smile reanimation.

Key Findings

• Created the first validated assessment tool specifically for smile spontaneity
• Demonstrated reliable differentiation between voluntary and spontaneous smiles
• Provides an objective outcome measure for evaluating smile reanimation success

What This Means for Patients

Measuring smile spontaneity captures what matters most to patients—whether their smile feels and looks natural in social interactions.