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Related Concept Videos

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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Tooth Anatomy01:21

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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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The oral cavity, or the mouth, is a complex structure in humans that plays a vital role in our day-to-day lives. Its role is not only in chewing and swallowing food; it also plays a role in speech and facial expressions.
Teeth: The teeth are the hardest structures in our bodies. Humans have two sets of teeth throughout their lifetime: deciduous (baby) teeth and permanent teeth. Each tooth consists of several parts: the crown (visible part), the root (embedded in the jaw), enamel (hard outer...
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Related Experiment Video

Updated: Aug 19, 2025

Mimicking and Measuring Occlusal Erosive Tooth Wear with the "Rub&Roll" and Non-contact Profilometry
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The Ruminant sorting mechanism protects teeth from abrasives.

Sarah O Valerio1, Jürgen Hummel2, Daryl Codron3

  • 1Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Zurich 8057, Switzerland.

Proceedings of the National Academy of Sciences of the United States of America
|December 2, 2022
PubMed
Summary

Ruminants possess a unique rumen sorting mechanism that effectively washes ingested food, reducing dental wear from grit. This adaptation explains their ability to thrive on abrasive diets with less specialized teeth.

Keywords:
chewing efficiencydental evolutionforestomach

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Area of Science:

  • Paleontology
  • Zoology
  • Veterinary Science

Background:

  • Dental wear from ingested grit is a significant challenge for herbivores.
  • Ruminants evolved complex teeth and chewing surfaces for efficient food processing.
  • The rumen's sorting mechanism was hypothesized to provide internal food washing, but lacked in vivo evidence.

Purpose of the Study:

  • To investigate the in vivo efficacy of the rumen's food-washing capacity.
  • To determine if the rumen mechanism protects ruminant teeth from abrasive dietary particles.
  • To understand the implications for dental evolution and paleontology.

Main Methods:

  • Studied four live, cannulated cows fed a diet with added sand.
  • Analyzed silica content in swallowed food, feces, and regurgitated material.
  • Compared silica levels to assess the effectiveness of the rumen sorting mechanism.

Main Results:

  • Silica levels in swallowed food and feces indicated sand ingestion.
  • Regurgitated food, processed via rumination, showed silica levels similar to the base diet.
  • This demonstrates an internal washing mechanism within the rumen.

Conclusions:

  • The rumen sorting mechanism effectively removes ingested grit, protecting teeth.
  • Ruminants can tolerate abrasive diets with less need for extreme dental morphology compared to non-ruminants.
  • This wear-protection mechanism is a crucial factor in ruminant evolutionary success and diversity.