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Related Concept Videos

Tooth Anatomy01:21

Tooth Anatomy

2.5K
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...
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Teeth01:15

Teeth

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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.
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...
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The Fossil Record02:56

The Fossil Record

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The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
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Related Experiment Video

Updated: Mar 7, 2026

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology
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Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

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Paleobiology: A Tooth for a Tooth.

Zerina Johanson1

  • 1Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK.

Current Biology : CB
|February 8, 2017
PubMed
Summary

Many vertebrates replace teeth by shedding. Fossil fish analyses reveal this shedding involved tooth resorption, a primitive bony fish trait absent in sharks.

Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Comparative Anatomy

Background:

  • Vertebrate tooth replacement is common, often involving shedding.
  • Tooth shedding mechanisms vary across vertebrate lineages.
  • Understanding the evolution of tooth replacement provides insights into vertebrate evolution.

Purpose of the Study:

  • To investigate the mechanism of tooth shedding in a fossil fish.
  • To determine if tooth resorption was involved in the shedding process.
  • To compare the findings with tooth replacement strategies in extant vertebrates.

Main Methods:

  • Analysis of fossilized jaw elements containing teeth.
  • Histological examination of tooth-bone interfaces.
  • Comparative analysis with extant bony fishes and chondrichthyans.

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Sampling and Pretreatment of Tooth Enamel Carbonate for Stable Carbon and Oxygen Isotope Analysis
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Optimized Bone Sampling Protocols for the Retrieval of Ancient DNA from Archaeological Remains
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Main Results:

  • Fossil fish shedding involved significant tooth resorption.
  • Evidence of resorption was observed at the base of shed teeth.
  • This indicates tooth resorption is a primitive feature in bony fishes.

Conclusions:

  • Tooth shedding via resorption is an ancient trait in bony fishes.
  • This mechanism is evolutionarily distinct from tooth replacement in sharks and their relatives.
  • The findings contribute to understanding the diversity of dental evolution in vertebrates.