tooth

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tooth:

see teethteeth,
hard, calcified structures embedded in the bone of the jaws of vertebrates that perform the primary function of mastication. Humans and most other mammals have a temporary set of teeth, the deciduous, or milk, teeth; in humans, they usually erupt between the 6th and 24th
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Tooth

One of the structures found in the mouth of most vertebrates which, in their most primitive form, were conical and were usually used for seizing, cutting up, or chewing food, or for all three of these purposes. The basic tissues that make up the vertebrate tooth are enamel, dentin, cementum, and pulp (see illustration).

Structure of a toothenlarge picture
Structure of a tooth

Enamel is the hardest tissue in the body because of the very high concentration, about 96%, of mineral salts. The remaining 4% is water and organic matter. The enamel has no nerve supply, although it is nourished to a very slight degree from the dentin it surrounds. The fine, microscopic hexagonal rods (prisms) of apatite which make up the enamel are held together by a cementing substance.

Dentin, a very bonelike tissue, makes up the bulk of a tooth, consisting of 70% of such inorganic material as calcium and phosphorus, and 30% of water and organic matter, principally collagen. The rich nerve supply makes dentin a highly sensitive tissue; this sensitivity serves no obvious physiological function.

Cement is a calcified tissue, a type of modified bone less hard than dentin, which fastens the roots of teeth to the alveolus, the bony socket into which the tooth is implanted. A miscellaneous tissue, consisting of nerves, fibrous tissue, lymph, and blood vessels, known as the pulp, occupies the cavity of the tooth surrounded by dentin.

The dentition of therian mammals, at least primitively, consists of four different kinds of teeth. The incisors (I) are usually used for nipping and grasping; the canines (C) serve for stabbing or piercing; the premolars (Pm) grasp, slice, or function as additional molars; and the molars (M) do the chewing, cutting, and grinding of the food. Primitively the placentals have 40 teeth and the marsupials 50.

In therian mammals, probably because of the intricacies and vital importance of tooth occlusion, only part of the first (or “milk”) dentition is replaced. This second, or permanent, dentition is made up of incisors, canines, and premolars; as a rule only one premolar is replaced in marsupials. Although the molars erupt late in development and are permanent, that is, not replaced, they are part of the first, or deciduous, dentition.

tooth

One of a series of carved ornaments, typically a pyramidal shape or a four-petal flower, usually set in a concave molding band; used in the Romanesque and Gothic Revival styles. See also: Ornament

tooth

[′tüth]
(anatomy)
One of the hard bony structures supported by the jaws in mammals and by other bones of the mouth and pharynx in lower vertebrates serving principally for prehension and mastication.
(design engineering)
One of the regular projections on the edge or face of a gear wheel.
An angular projection on a tool or other implement, such as a rake, saw, or comb.
(graphic arts)
The coarse or abrasive quality of a paper or a painting ground that assists in the application of charcoal, pastels, or paint.
A paper texture that holds ink more readily.
(invertebrate zoology)
Any of various sharp, horny, chitinous, or calcareous processes on or about any part of an invertebrate that functions like or resembles vertebrate jaws.

tooth

1. In a paint film, a fine texture imparted either by pigments or by the abrasives used in sanding; this texture provides a good base for the adhesion of a subsequent coat of paint.
2. A dogtooth, 2.

tooth

1. any of various bonelike structures set in the jaws of most vertebrates and modified, according to the species, for biting, tearing, or chewing
2. any of various similar structures in invertebrates, occurring in the mouth or alimentary canal
3. any of the various small indentations occurring on the margin of a leaf, petal, etc.
4. any one of a number of uniform projections on a gear, sprocket, rack, etc., by which drive is transmitted
References in periodicals archive ?
Toothy Sayers agrees: "I have read what Psychic Mary predicts and despite her being an astrologer and me a seer, our predictions are in alignment.
Mum Helen, 31, had an extra special reason for being delighted with her new toothy baby.
Notting Hill (Universal Studios: 1999) Can an American superstar (Anna Scott) with Julia Roberts' megawatt smile find happiness with a shy British bookstore owner (William Thacker) with Hugh Grant's toothy, self-effacing grin?
Replacing them is unabashed excitement--the anticipation of seeing some toothy creature knife up out of the lake's rocky depths to take a lure, its bronze flanks flashing in a breeze brisk, sun-sparkling morning, each leap punctuated by shouts of unrestrained glee.
It isn't just parents that are smiling, executives at Kohl's (NYSE:KSS) have a wide toothy grin on their faces at this time of year.
With a toothy grin, flappy ears, flared nostrils, and bulging eyes, the beast is the spitting image of the Star Wars character.
It turned out there was a field of marijuana growing on the scene, with two scaly, toothy "security agents" guarding the dope.
Toothy I'm privileged to have a job which lets me at these people.
Inspired casting, it was not - swapping one tubby West Midlands wisecracker for another, well, tubby Northern wisecracker and trading in a toothy Celtic beauty for one with slightly shorter hair.
Ed Miliband, the toothy pretender to the New Labour leadership, is just one who likes to wander down Wisteria Lane of a Wednesday night.
on the coal When she's bevied she's really a shocker She got a few bob when she left her last job Made redundant when she was a Docker She got 22 grand cash in her hand But even with that lump sum She does nothing but cry Cos hard as they try The doctors just can't fix her Hump I say, "Look so yer fat, well never mind "You're the one girl, I'll never ditch "With yer black toothy grin, yer ugly as sin "But let's face it, yer bloody well rich
Florida inshore saltwater fly fishers don't give much mind to wire leaders until toothy fish start to empty their fly boxes.