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Tooth Anatomy

Tooth Anatomy

The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.

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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...

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The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
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Related Experiment Video

Updated: Jun 16, 2026

Establishing Organoids from Human Tooth as a Powerful Tool Toward Mechanistic Research and Regenerative Therapy

Establishing Organoids from Human Tooth as a Powerful Tool Toward Mechanistic Research and Regenerative Therapy

Published on: April 13, 2022

Dact1-3 mRNAs exhibit distinct expression domains during tooth development.

Päivi Kettunen¹, Saul Kivimäe, Pankaj Keshari

¹Section of Anatomy and Cell Biology, Department of Biomedicine, University of Bergen, Jonas Lies vei 91, 5009 Bergen, Norway. Paivi.Kettunen@biomed.uib.no

Gene Expression Patterns : GEP

|February 23, 2010

Summary

Dact proteins regulate Wnt signaling during tooth development. Dact1 and Dact3 are expressed in dental mesenchyme, while Dact2 is in dental epithelium, suggesting distinct roles in tooth formation.

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Using Ex Vivo Live Imaging to Investigate Cell Divisions and Movements During Mouse Dental Renewal

Using Ex Vivo Live Imaging to Investigate Cell Divisions and Movements During Mouse Dental Renewal

Published on: October 27, 2023

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Last Updated: Jun 16, 2026

Establishing Organoids from Human Tooth as a Powerful Tool Toward Mechanistic Research and Regenerative Therapy

Establishing Organoids from Human Tooth as a Powerful Tool Toward Mechanistic Research and Regenerative Therapy

Published on: April 13, 2022

Using Ex Vivo Live Imaging to Investigate Cell Divisions and Movements During Mouse Dental Renewal

Using Ex Vivo Live Imaging to Investigate Cell Divisions and Movements During Mouse Dental Renewal

Published on: October 27, 2023

Area of Science:

Developmental Biology
Molecular Biology
Craniofacial Development

Background:

Wnt signaling is crucial for tooth formation.
Dact proteins (Dact1-3) modulate Wnt signaling by interacting with Dishevelled (Dvl).

Purpose of the Study:

To investigate the expression patterns of mouse Dact1, Dact2, and Dact3 during early tooth development.
To understand the potential roles of Dact genes in modulating Wnt signaling in specific tooth germ compartments.

Main Methods:

Section in situ hybridization was used to analyze Dact1-3 gene expression.
Analysis spanned from the morphological initiation of mandibular first molar development to the onset of root formation.

Main Results:

Dact2 expression was confined to the dental epithelium, including enamel knots and pre-ameloblasts.
Dact1 and Dact3 exhibited distinct, developmentally regulated expression in the dental mesenchyme.
Dact1 and Dact3 were detected in presumptive mesenchyme, with Dact1 later appearing in dental follicle and papilla, while Dact3 persisted in mesenchyme and preodontoblasts.

Conclusions:

Dact1 and Dact3 likely modulate Wnt signaling in the dental mesenchyme, including preodontoblasts, during early tooth formation.
Dact2 may play a role in signaling within the dental epithelium, affecting enamel knot and pre-ameloblast function.
Further loss-of-function studies are needed to clarify potential redundancy between Dact1 and Dact3.