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- Tooth abstract "A tooth (plural teeth) is a small, calcified, whitish structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores, also use teeth for hunting or for defensive purposes. The roots of teeth are covered by gums. Teeth are not made of bone, but rather of multiple tissues of varying density and hardness. The cellular tissues that ultimately become teeth originate from the embryonic germ layer, the ectoderm.The general structure of teeth is similar across the vertebrates, although there is considerable variation in their form and position. The teeth of mammals have deep roots, and this pattern is also found in some fish, and in crocodilians. In most teleost fish, however, the teeth are attached to the outer surface of the bone, while in lizards they are attached to the inner surface of the jaw by one side. In cartilaginous fish, such as sharks, the teeth are attached by tough ligaments to the hoops of cartilage that form the jaw.Teeth are among the most distinctive (and long-lasting) features of mammal species. Paleontologists use teeth to identify fossil species and determine their relationships. The shape of the animal's teeth are related to its diet. For example, plant matter is hard to digest, so herbivores have many molars for chewing and grinding. Carnivores, on the other hand, need canines to kill prey and to tear meat.Mammals in general are diphyodont, meaning that they develop two sets of teeth. In humans, 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 tooth eruption at about six months is known as teething and can be painful. Kangaroos, elephants and manatees are unusual among mammals because they are polyphyodonts.Some animals develop only one set of teeth (monophyodont) while others develop many sets (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 gnawing, which helps maintain relatively constant length. The industry of the beaver is due in part to this qualification. Many rodents such as voles (but not mice) and guinea pigs, as well as leporidae like rabbits, have continuously growing molars in addition to incisors.Teeth are not always attached to the jaw, as they are in mammals. In many reptiles and fish, teeth are attached to the palate or to the floor of the mouth, forming additional rows inside those on the jaws proper. Some teleosts even have teeth in the pharynx. While not true teeth in the usual sense, the denticles of sharks are almost identical in structure, and are likely to have the same evolutionary origin. Indeed, teeth appear to have first evolved in sharks, and are not found in the more primitive jawless fish - while lampreys do have tooth-like structures on the tongue, these are in fact, composed of keratin, not of dentine or enamel, and bear no relationship to true teeth. Though "modern" teeth-like structures with dentine and enamel have been found in late conodonts, they are now supposed to have evolved independently of later vertebrates' teeth. Living amphibians typically have small teeth, or none at all, since they commonly feed only on soft foods. In reptiles, teeth are generally simple and conical in shape, although there is some variation between species, most notably the venom-injecting fangs of snakes. The pattern of incisors, canines, premolars and molars is found only in mammals, and to varying extents, in their evolutionary ancestors. The numbers of these types of teeth varies greatly between species; zoologists use a standardised dental formula to describe the precise pattern in any given group.".
- Tooth thumbnail Close_up_-_chimpanzee_teeth.png?width=300.
- Tooth wikiPageID "25631460".
- Tooth wikiPageRevisionID "605650185".
- Tooth hasPhotoCollection Tooth.
- Tooth wordnet_type synset-human_body-noun-1.
- Tooth subject Category:Animal_anatomy.
- Tooth subject Category:Articles_with_inconsistent_citation_formats.
- Tooth comment "A tooth (plural teeth) is a small, calcified, whitish structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores, also use teeth for hunting or for defensive purposes. The roots of teeth are covered by gums. Teeth are not made of bone, but rather of multiple tissues of varying density and hardness.".
- Tooth label "Dente".
- Tooth label "Dente".
- Tooth label "Tand".
- Tooth label "Tooth".
- Tooth label "Zahn".
- Tooth label "Zęby".
- Tooth label "Зуб (биология)".
- Tooth label "سن".
- Tooth label "歯".
- Tooth label "牙齒".
- Tooth sameAs Zub.
- Tooth sameAs Zahn.
- Tooth sameAs Hortz.
- Tooth sameAs Gigi.
- Tooth sameAs Dente.
- Tooth sameAs 歯.
- Tooth sameAs 이_(몸).
- Tooth sameAs Tand.
- Tooth sameAs Zęby.
- Tooth sameAs Dente.
- Tooth sameAs m.0cnxs6x.
- Tooth sameAs Q553.
- Tooth sameAs Q553.
- Tooth wasDerivedFrom Tooth?oldid=605650185.
- Tooth depiction Close_up_-_chimpanzee_teeth.png.
- Tooth isPrimaryTopicOf Tooth.
