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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...

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Updated: Aug 2, 2025

Detection and Removal of Tooth-Colored Composite Resin Using the Fluorescence-Aided Identification Technique

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Published on: July 27, 2022

Dentin abrasion using whitening toothpaste with various hydrogen peroxide concentrations.

Jae-Heon Kim¹, Soyeon Kim¹, Franklin Garcia-Godoy^2,3

¹Department of Oral Anatomy and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, S. Korea.

American Journal of Dentistry

|April 19, 2023

Summary

Whitening toothpastes with less than 9% hydrogen peroxide showed minimal dentin abrasion. Conventional toothpastes caused significantly more abrasion, linked to higher particle content.

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Area of Science:

Dental materials science
Oral hygiene product safety

Background:

Toothpastes vary in abrasiveness, impacting dental health.
Hydrogen peroxide is a common whitening agent, but its interaction with dentin requires investigation.

Purpose of the Study:

To compare dentin abrasion from whitening, conventional, and experimental toothpastes with varying hydrogen peroxide concentrations.
To analyze the correlation between dentin abrasion, toothpaste pH, and particle content.

Main Methods:

Bovine dentin specimens were subjected to 10,000 toothbrushing strokes using different toothpaste formulations.
Dentin abrasion was quantified using a 3D surface profiler.
Toothpaste pH, particle weight percentages, and composition were analyzed.

Main Results:

Conventional toothpastes exhibited 1.1-3.6 times more abrasion than whitening toothpastes.
Higher toothpaste pH correlated with increased abrasion.
Dentin abrasion showed a strong positive correlation with the weight percentage of particles in the toothpaste.

Conclusions:

Whitening toothpastes with hydrogen peroxide concentrations below 9% demonstrated no significant dentin surface harm.
Toothpaste abrasiveness is strongly linked to particle content, not solely hydrogen peroxide concentration.
Findings provide valuable data for consumers and dental professionals regarding toothpaste safety.