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Tooth, plural teeth, are hard structures found in the jaws of many of the higher animals. They have various structures to allow them to fulfill different purposes. The primary funtion of teeth is to tear and chew food and in some animals, particularly carnivores, as a weapon. The roots of the teeth are covered by gums.
Types of teeth

The form teeth take and their mode of development in a species is called the species' dentition. Dentists sometimes refer to the inner surface of teeth as the lingual surface (meaning towards the tongue), and the outer surface as the labial surface (meaning towards the lips) or "buccal" (meaning towards the cheek). Other terms are "Mesial", or toward the midline, "Distal", which is away from the midline, "Occlusal", the top surface, or incisal, the cutting surfaces.

Humans grow two sets of teeth, though some animals grow many more: sharks grow a new set of teeth every two weeks. Some other animals grow just one set. Rodent teeth grow and wear away continually through the animal's gnawing, maintaining constant length.

In humans, the first (a.k.a. milk, primary or deciduous) set of teeth appears at about six months of age. This stage is known as teethingTeething is the process during which an infant's teeth start to sequentially grow in. Teething can start as early as three months or as late, in some cases, as twelve months. It can take up to several years for all 20 deciduous (aka "baby" or "milk") teet and can be quite painful for an infant. Human children have 20 milk teeth evenly distributed across the quadrants. Each quadrant of 5 teeth consists of:

The second, permanent set is formed between the ages of six and twelve years. The new set replaces the 20 teeth of the old set. A new tooth forms underneath the old one, pushing it out of the jaw. Apart from this another 8-12 teeth grow. This set can last for life if cared for properly through regular brushing with water or toothpasteToothpaste is a paste used, almost always in conjunction with a toothbrush, to clean teeth. The earliest known reference to a toothpaste is in a manuscript from Egypt in the 4th century A. which prescribes a mixture of powdered salt, pepper, mint leaves,.

Types of tissue in teeth

In HumanHuman beings are defined variously in biological, spiritual, and cultural terms, or in combinations thereof. Biologically, they are classified as Homo sapiens ( Latin for knowing man , a primate species of mammal with a highly developed brain. In spirituas


In Aardvarks

Adult humans have 32 teeth evenly distributed across the quadrants. Each quadrant of 8 teeth consists:

The last molar of each quadrant (i.e. the third molar and commonly referred to as wisdom teeth) may or may not erupt.

The teeth are numbered, in the most common American system, 1-16 and 17-32, with 1 being the upper right wisdom tooth (whether or not it is present) and 32 being the lower right wisdom tooth.

Teeth are among the most distinctive features of different mammal species, and one that fossilizes well. Paleontologists use them to identify fossil species and, often, their relationships. The shape of the teeth is related to the animal's diet, as well as its evolutionary descent. For example, herbivore diets are harder to digest thus herbivores have more molars for chewing. Carnivores need canines to kill and tear and since meat is easier to digest, can swallow without the need for molars to chew the food well.



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Tooth Teeth Foods Caries Surface Food Enamel Sugar Grow

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Tooth Fairy RuleAmong science fiction writers, the Tooth Fairy Rule states that a mysterious outside force (the tooth fairy, for example) may be invoked to explain the unexplainable only once in a story. One can't expect to maintain the all-important suspension of disbelToothTooth plural teeth are hard structures found in the jaws of many of the higher animals. They have various structures to allow them to fulfill different purposes. The primary funtion of teeth is to tear and chew food and in some animals, particularly carniToothwortToothwort the popular name for a small British plant of curious form and growth, known botanically as Lathraea squamaria family: Scrophulariaceae. It grows parasitically on roots, chiefly of hazel (or holly), in shady places such as hedge sides. It consis
Tooth fairyThe tooth fairy is a fictional spirit said to give children a small amount of money in exchange for a tooth when it falls out of the deciduous dentition. The Tooth Fairy is an example of folklore mythology which adults know is fiction, but which is sometiToothbrushThe toothbrush is a brush used to clean teeth. Many traditional cultures around the world have cleaned their teeth by rubbing twigs or pieces of wood against them since ancient times. Rubbing baking soda or chalk against the teeth was also common. AccordiToothpasteToothpaste is a paste used, almost always in conjunction with a toothbrush, to clean teeth. The earliest known reference to a toothpaste is in a manuscript from Egypt in the 4th century A. which prescribes a mixture of powdered salt, pepper, mint leaves,
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