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Updated: Mar 7, 2026

Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants

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Published on: March 29, 2018

Childhood intelligence and early tooth wear patterns.

Tuomo Heikkinen¹, Jaana Rusanen¹, Koshi Sato²

¹a Department of Oral Development and Orthodontics, Unit of Oral Health Sciences , Medical Research Center, University of Oulu, Oulu University Hospital , Oulu , Finland.

Cranio : the Journal of Craniomandibular Practice

|February 22, 2017

Summary

Early dental wear patterns show subtle links to childhood intelligence (IQ). Asymmetric tooth wear in children may relate to gender differences in cognitive development and brain lateralization.

Keywords:

Attrition bimaturism brain function bruxism intelligence quotient lateralization preschool

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Mimicking and Measuring Occlusal Erosive Tooth Wear with the "Rub&Roll" and Non-contact Profilometry

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Published on: August 15, 2018

Area of Science:

Pediatric Dentistry
Developmental Psychology
Neuroscience

Background:

Investigating the historical link between cognitive function and oral habits like bruxism.
Understanding potential early indicators of cognitive development.

Purpose of the Study:

To explore the relationship between early dental wear patterns and preschool Intelligence Quotient (IQ).
To examine potential correlations between tooth wear, gender, and cognitive performance.

Main Methods:

Cross-sectional study of 864 Euro-American children.
IQ testing at age 4 and dental wear assessment at mean age 7.8 years.
Dental wear classified as symmetric, right-sided, or left-sided.

Main Results:

Limited overall association between tooth wear and IQ, with social factors playing a role.
Significant gender differences in asymmetric wear, suggesting jaw function influences cognitive performance.
Left-sided tooth wear correlated with higher IQ scores in girls at preschool age.

Conclusions:

Early left-sided tooth wear may be associated with advanced verbal skills in girls, potentially linked to brain lateralization and earlier maturation.
Gender-specific patterns in jaw function and tooth wear warrant further investigation regarding cognitive development.