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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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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.


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


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.


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.


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 classic literature ?
The plump, well-fed little baby, on seeing her mother, as she always did, held out her fat little hands, and with a smile on her toothless mouth, began, like a fish with a float, bobbing her fingers up and down the starched folds of her embroidered skirt, making them rustle.
Yet would I hold men, toothless and a hundred, my nose touching my chin.
On the other side of the fireplace, in the horse-hair arm-chair where Mrs Verloc's mother was generally privileged to sit, Karl Yundt giggled grimly, with a faint black grimace of a toothless mouth.
His worn-out passion, resembling in its impotent fierceness the excitement of a senile sensualist, was badly served by a dried throat and toothless gums which seemed to catch the tip of his tongue.
Rout's toothless and venerable mother a little cottage near Teddington.
As the party drew nigher to this solitary being, and came within a distance to be heard, a low growl issued from the grass at his feet, and then, a tall, gaunt, toothless, hound, arose lazily from his lair, and shaking himself, made some show of resisting the nearer approach of the travellers.
His right hand was raised to his lips, and as, absorbed in thought, he hit his long black nails, he disclosed among his toothless gums a few such fangs as should have been a dog's or rat's.
For his part, the teenage "Hiccup" is a dreamer who's good at devising gadgets--like the prosthetic tail fin that permits the injured Toothless to fly.
Valerie Trierweiler includes claims that Frankie boy continued to woo her after his indiscretion and accuses the left-wing politician of mocking the poor in private, calling them "the toothless ones".
Featuring Fan-Favorites Toothless and Hiccup, the Dragons App Includes Stunning Visuals and a Multi-Layered Storytelling Experience for three Distinct Age Groups
FIVE years have passed since Hiccup (voiced by Jay Baruchel) befriended Toothless and the inhabitants of the village of Berk now live in harmony with the dragons.
HOW TO TRAIN YOUR DRAGON 2 (PG) FIVE years have passed since Hiccup (voiced by Jay Baruchel) befriended Toothless and the inhabitants of the village of Berk now live in harmony with the dragons.