tooth (tooth) pl. teeth one of the hard, calcified structures set in the alveolar processes of the jaws for the biting and mastication of food. 
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Schematic cross section of an anterior (left) and a posterior (right) tooth in the maxilla.
accessional teeth those having no deciduous predecessors: the permanent molars.
artificial tooth one made of porcelain or other synthetic compound in imitation of a natural tooth.
auditory teeth of Huschke toothlike projections in the cochlea.
bicuspid tooth premolar t.
canine tooth , cuspid tooth the third tooth on either side from the midline in each jaw. Symbol C.
deciduous teeth primary teeth; the 20 teeth of the first dentition, which are shed and replaced by the permanent teeth.
eye tooth a canine tooth of the upper jaw.
Hutchinson's teeth notched, narrow-edged permanent incisors, sometimes but not always a sign of congenital syphilis.
impacted tooth one prevented from erupting by a physical barrier.
incisor tooth one of the four front teeth, two on each side of the midline, in each jaw. Symbol I.
milk teeth deciduous teeth.
molar tooth any of the posterior teeth on either side in each jaw, numbering three in the permanent dentition and two in the deciduous. Symbol M.
peg tooth , peg-shaped tooth a tooth whose sides converge or taper together incisally.
permanent teeth the 32 teeth of the second dentition.
premolar tooth bicuspid tooth; either of two permanent teeth found between the canine and molar teeth. Symbol P.
primary teeth deciduous teeth.
stomach tooth a canine tooth of the lower jaw.
successional teeth the permanent teeth that have deciduous predecessors.
temporary teeth deciduous teeth.
wisdom tooth the last molar tooth on either side in each jaw.
Peg Tooth
A barrel-shaped incisor which, when accompanied by a central notch is a ‘classic’ finding in congenital syphilis. Peg teeth may also be seen in Williams—elfin-facies—syndrome, and in anhidrotic, hipohidrotic, and Robinson types of ectodermal dysplasia
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