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Related Concept Videos

Tooth Anatomy01:21

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.
Teeth01:15

Teeth

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 and...
Blood and Nerve Supply to the Bones01:29

Blood and Nerve Supply to the Bones

Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
Tonsillitis II: Management01:26

Tonsillitis II: Management

This lesson will focus on the different treatment options for managing tonsillitis, which typically depend on the cause and severity.
Pain01:20

Pain

Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
Local Anesthetics: Adverse Effects01:12

Local Anesthetics: Adverse Effects

While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...

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Related Experiment Video

Updated: Jun 17, 2026

Impact of Common Fruit Juices and Toothbrushing on the Discoloration of Primary Teeth
04:40

Impact of Common Fruit Juices and Toothbrushing on the Discoloration of Primary Teeth

Published on: March 27, 2026

Pretty painful: why does tooth bleaching hurt?

Kenneth Markowitz1

  • 1Department of Oral Biology, New Jersey Dental School, University of Medicine and Dentistry of New Jersey, Newark, NJ 07103, USA. markowkj@umdnj.edu

Medical Hypotheses
|January 5, 2010
PubMed
Summary
This summary is machine-generated.

Tooth whitening can cause bleaching sensitivity (BS) due to peroxide. Researchers hypothesize that the TRPA1 ion channel directly activates nerves, causing BS pain. This suggests potassium salts may treat this sensitivity.

Related Experiment Videos

Last Updated: Jun 17, 2026

Impact of Common Fruit Juices and Toothbrushing on the Discoloration of Primary Teeth
04:40

Impact of Common Fruit Juices and Toothbrushing on the Discoloration of Primary Teeth

Published on: March 27, 2026

Area of Science:

  • Dental Science
  • Pain Research
  • Biochemistry

Background:

  • Vital bleaching is popular for tooth discoloration, using peroxide-based products.
  • Bleaching sensitivity (BS) is a common side effect, causing pain in intact teeth without stimulus.
  • The mechanism of BS pain is unknown, differing from dentin sensitivity (DS).

Purpose of the Study:

  • To investigate the mechanism of bleaching sensitivity (BS) pain.
  • To differentiate BS pain from dentin sensitivity (DS).
  • To propose a potential treatment for BS based on its mechanism.

Main Methods:

  • Literature review on bleaching sensitivity and dentin sensitivity.
  • Exploration of the role of TRPA1 ion channels in pain pathways.
  • Hypothesizing the mechanism of nociceptor activation in BS.

Main Results:

  • Peroxide penetrates tooth structure to whiten teeth.
  • Bleaching sensitivity (BS) pain occurs without stimulus, unlike DS.
  • TRPA1 channels are activated by oxidizers like hydrogen peroxide and expressed in pulpal nerves.

Conclusions:

  • TRPA1 channel activation in pulpal sensory afferents is hypothesized as the mechanism for BS pain.
  • This differs from the mechanosensitive nerve activation in DS.
  • Treatments reducing intradental nerve excitability, like potassium salts, may be effective for BS.