Related Experiment Video
Updated: May 19, 2026

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease
Published on: July 24, 2019
Dynamics of a smile in different age groups
Patil Chetan1, Pradeep Tandon, Gulshan K Singh
1Department of Orthodontics and Dentofacial Orthopaedics, Faculty of Dental Sciences, CSM Medical University, Lucknow, UP, India. drchetpat85@yahoo.co.in
Smile dimensions change with age and gender. Dynamic measurements decrease with age, with males showing greater changes in lip length and commissure height, while females exhibit wider smiles.
Area of Science:
- Anthropology
- Dentistry
- Facial Aesthetics
Background:
- Smile characteristics are crucial in facial aesthetics and communication.
- Understanding age-related and gender-specific smile variations is important for clinical applications.
Purpose of the Study:
- To analyze smile dimensions across different age groups.
- To identify gender-based differences in smile characteristics.
Main Methods:
- Digital videography was used for smile analysis in 200 subjects (aged 15-50 years).
- Subjects were categorized into four age groups and by gender.
- Two-way multivariate analysis of variance (MANOVA) was employed for statistical analysis.
Main Results:
- Dynamic smile measurements (lip length, thickness, commissure height, intercommissural width) decreased with age in both genders.
- Males showed greater changes in upper lip length and commissure height compared to females.
- Females exhibited a greater increase in intercommissural width during smiling across all age groups.
Conclusions:
- Smile dynamics are significantly influenced by aging and gender.
- Females generally present with a wider smile compared to males of similar age.
- These findings have implications for facial analysis and aesthetic procedures.
More Related Videos
19:53Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer
Published on: March 1, 2015
07:14Investigating the 'Uncatchable Smile' in Leonardo da Vinci's La Bella Principessa: A Comparison with the Mona Lisa and Pollaiuolo's Portrait of a Girl
Published on: October 4, 2016
Related Concept Videos
Uniform Distribution
Teeth
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin and...
Muscles for Facial Expressions
Facial Feedback Hypothesis
Three Developmental Domains
Physical Development
Physical processes, also known as maturation, encompass the biological changes that occur across an individual's life. These changes begin with genetic inheritance and continue through various stages, including growth in height and weight,...
Introduction to Developmental Psychology