News tagged with tooth

Five tasty diet desserts

(HealthDay)—Satisfying a sweet tooth can be tricky when you're trying to reach or maintain an ideal weight. You want to enjoy dessert without racking up fat and calories or triggering the urge to overeat.

Nov 17, 2017
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Using an electronic device to detect cavities early

 Imagine if dentists could find clear signs of tooth decay long before dental lesions turn into cavities and without using X-rays. A new device cleared for commercialization this month by the Food and Drug Administration ...

Nov 02, 2017
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Antimicrobial gel could improve root canal results

More than 15 million root canals are done each year, according to the American Association of Endodontists. During the procedure, the tooth's pulp and nerve are removed before the tooth is cleaned and sealed. If bacteria, ...

Oct 23, 2017
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Research shows aspirin could repair tooth decay

Researchers at Queen's University Belfast have discovered that aspirin could reverse the effects of tooth decay resulting in a reduction in the need for fillings. Currently about 7 million fillings are provided by the NHS ...

Sep 08, 2017
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Tooth

Teeth (singular tooth) are small whitish structures found in the jaws (or mouths) of many vertebrates that are used to tear, scrape, and chew food. Some animals, particularly carnivores, also use teeth for hunting or defense. The roots of teeth are covered by gums. Teeth are not made of bone, but rather of tissues of varying density and hardness.

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. Carnivores, on the other hand, need canines to kill prey and to tear meat.

Mammals 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.

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, maintaining relatively constant length. Many rodents such as voles (but not mice) and guinea pigs, as well as rabbits, have continuously growing molars in addition to incisors.

This text uses material from Wikipedia, licensed under CC BY-SA

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