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  • Term: tooth
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    tooth!


    tooth

    Comprehensive Analysis



    1) "Tooth" -- As to tooth

    tooth
    Pronunciation: 'tüth
    Function: noun
    Inflected Form(s): plural teeth /'tEth/
    Etymology: Middle English, from Old English tOth; akin to Old High German zand tooth, Latin dent-, dens, Greek odont-, odous
    1 a : one of the hard bony appendages that are borne on the jaws or in many of the lower vertebrates on other bones in the walls of the mouth or pharynx and serve especially for the prehension and mastication of food and as weapons of offense and defense b : any of various usually hard and sharp processes especially about the mouth of an invertebrate
    2 : TASTE, LIKING
    3 : a projection resembling or suggesting the tooth of an animal in shape, arrangement, or action <a saw tooth>: as a : any of the regular projections on the circumference or sometimes the face of a wheel that engage with corresponding projections on another wheel especially to transmit force : COG b : a small sharp-pointed marginal lobe or process on a plant
    4 a : something that injures, tortures, devours, or destroys <jealousy with rankling tooth -- Thomas Gray> b plural : effective means of enforcement <drug laws with teeth>
    5 : a roughness of surface produced by mechanical or artificial means
    - tooth·like /'tüth-"lIk/ adjective
    - in the teeth of
    1 : in or into direct contact or collision with <sailing in the teeth of a hurricane -- Current Biography>
    2 : in direct opposition to <rule had...been imposed by conquest in the teeth of obstinate resistance -- A. J. Toynbee>
    - to the teeth : FULLY, COMPLETELY <armed to the teeth>
    [tooth illustration]
    Pronunciation Symbols

    "Teeth" redirects here. For the film, see Teeth (film).
    The visible teeth of a smile.

    Teeth (singular, tooth) are structures found in the jaws of many vertebrates. The primary function of teeth is to tear, scrape, and chew food, and in some animals, particularly carnivores, for fighting and/or defence. The roots of the teeth are covered by gums. Adult teeth naturally darken with age as the pulp within the tooth shrinks and dentin is deposited in its place.

    Teeth are among the most distinctive features of mammal species and fossils. Paleontologists use them to identify fossil species and their relationships. The shape of the teeth is related to the animal's diet. For example, plant matter is hard to digest, so herbivores have many molars for chewing. Carnivores need canines to kill and tear meat.

    Humans are diphyodont, meaning that they develop two sets of teeth throughout life. The first set (the "baby," "milk," "primary" or "deciduous" set) normally starts to appear at about six months of age, although some babies are born with one or more visible teeth, known as neonatal teeth. Normal eruption of teeth starting at about six months is known as teething and can be quite painful for an infant.

    Some animals develop only one set of teeth (monophyodont) or develop many (polyphyodont). Sharks, for example, grow a new set of teeth every two weeks to replace worn teeth. Rodent incisors grow and wear away continually through the animal's gnawing, maintaining approximately constant length. Some rodent species such as the sibling vole[1] and the guinea pig[2] have also continuously growing molars.