Tooth
:This page discusses bony structures used for chewing and eating. For tooth care, see oral hygiene. For the engineering sense of "tooth", see "gear"
Related Topics:
Oral hygiene - Gear
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Types of teeth
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- Molars are used for grinding up foods
- Carnassials are used for slicing food. In carnivores only.
- Premolars are similar to molars but smaller and sometimes called "bicuspids"
- Canines are used for tearing apart foods and sometimes called "cuspids"
- Incisors are used for cutting foods
- Enamel is a hard outer layer consisting of calcium and phosphate.
- Dentin is the inner layer, the bulk of the tooth.
- Pulp is the core, containing nerves and blood vessels.
- Cementum is the thin layer around the root; a bone-like material which connects the teeth to the jaw.
- Teeth lack enamel and have many pulp tubules, hence the name of the order Tubulidentata.
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Teeth—singular tooth—are hard structures found in the jaws of many vertebrates. They have various structures to allow them to fulfill their many different purposes. The primary function of teeth is to tear and chew food and in some animals, particularly carnivores, as a weapon. The roots of the teeth are covered by gums. Teeth are covered by a protective structure, called the enamel, that helps to prevent cavities on the teeth. Adult teeth naturally darken as the person matures, the pulp within the tooth shrinks and dentin is deposited in its place.
Related Topics:
Jaw - Vertebrate - Food - Carnivore - Gum - Enamel - Pulp - Dentin
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The form teeth take and their mode of development in a species is called the species' dentition. Dentists sometimes refer to the inner surface of teeth as the lingual surface (meaning towards the tongue), and the outer surface as the labial surface (meaning towards the lips) or "buccal" (meaning towards the cheek). Other terms are mesial (toward the midline), distal (away from the midline), occlusal (the top surface), incisal (the cutting surface), "gingival" (toward the gumline), and "pulpal" (toward the center).
Related Topics:
Dentition - Dentists - Tongue - Lips
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Types of tissue in teeth
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In Humans
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In Aardvarks
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Teeth are among the most distinctive features of different mammal species, and one that fossilizes well. Paleontologists use them to identify fossil species and, often, their relationships. The shape of the teeth is related to the animal's diet, as well as its evolutionary descent. For example, plant matter is hard to digest, so herbivores have many molars for chewing. Carnivores need canines to kill and tear and since meat is easy to digest, they can swallow without the need for molars to chew the food well.
Related Topics:
Mammal - Fossilizes - Paleontologists - Evolutionary - Herbivore - Chewing - Carnivore
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~ Table of Content ~
| ► | Introduction |
| ► | Human teeth |
| ► | Tooth decay |
| ► | Tooth care |
| ► | Dentures and "false" teeth |
| ► | Abnormalities of the dentition |
| ► | Development of teeth |
| ► | Facts about teeth in non-human animals |
| ► | See also |
| ► | External links |
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Latest news on tooth
Judd Joins Tooth's Johnson
Ashley Judd is set to star with Dwayne Johnson in 20th Century Fox's fantasy comedy Tooth Fairy, which shoots in Vancouver, Canada, in October, Variety reported. Michael Lembeck is directing.
Gorilla has sore tooth removed by dentist
Is there anything grumpier than a bear with a sore head? Maybe a gorilla with a broken tooth.
Teeth Can Yield Stem Cells, Scientists Say
Dental pulp from a wisdom tooth could be a new source of therapeutic stem cells, sidestepping the ethical concerns of embryonic cells, Japanese researchers claim.
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Curacao sprinter seeks gold to match tooth
WILLEMSTAD (Reuters) - Anyone closely watching the starting line of the Beijing Olympics 100-metre sprint may notice the flash of a gold tooth emblazoned with the letter
DreamWorks switches to Intel for stereoscopic 3-D high
Studio to AMD: Drop dead For computer animation studios, upgrading long-in-the-tooth server farms is a part of a natural cycle to keep things looking sharp. But they're a bit like butterflies flitting amongst hardware specs when it comes down to finding what they want to power "the next big thing."?
Pulling a tooth could lead to tailor-made sperm
Stem cells from human teeth have been coaxed into becoming sperm by injecting them into the testes of mice, claim researchers
Patients with new livers to get tooth care
LIVER transplant patients will receive special dental care after their operations under a scheme to be launched by NHS Lothian.
Tooth fairy hit by huge hike in the 'price' of baby teeth
The tooth fairy now leaves £1.20 under the pillows of children who have lost baby teeth.
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