May
some animals, particularly carnivores, also use teeth for hunting or defense.
the roots of teeth are covered by gums.
paleontologists use teeth to identify fossil species and determine their relationships.
teeth are among the most distinctive features of mammal species.
plant matter is hard to digest, so herbivores have many molars for chewing.
humans are diphyodont, meaning that they develop two sets of teeth.
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 t
normal tooth eruption 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) while others develop many sets (polyphyodont).
sharks, for example, grow a new set of teeth every two weeks to replace worn teeth.
some rodent species, such as the sibling vole and the guinea pig, have continuously growing molars in addition to incisors.
the development, appearance, and classification of teeth fall within its purview, though dental occlusion, or contact among teeth, does not.
dental anatomy is also a taxonomical science as it is concerned with the naming of teeth and their structures.
this information serves a practical purpose for dentists, enabling them to easily identify teeth and structures during treatment.
the anatomic crown of a tooth is the area covered in enamel above the cementoenamel junction (CEJ).
the majority of the crown is composed of dentin with the pulp chamber in the center.
the crown is within bone before eruption.
the anatomic root is found below the cementoenamel junction and is covered with cementum.
as with the crown, dentin composes most of the root, which normally have pulp canals.
a tooth may have multiple roots or just one root. Canines and most premolars, except for maxillary (upper) first premolars, usually have one root.
maxillary first premolars and mandibular molars usually have two roots.
maxillary molars usually have three roots.
humans usually have 20 primary teeth (also called deciduous, baby, or milk teeth) and 32 permanent teeth.
among primary teeth, 10 are found in the maxilla and the other 10 in the mandible.
teeth are classified as incisors, canines, and molars.
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