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Abnormality in number

Anodontia is the total lack of tooth development. Hyperdontia is the presence of a higher-than-normal number of teeth, whereas Hypodontia is the lack of some teeth. Usually, hypodontia refers to the lack of development of one or more teeth, and oligodontia may be used to describe the absence of 6 or more teeth. Some systemic disorders which may result in hyperdontia include Apert syndrome, Cleidocranial dysostosis, Crouzon syndrome, Ehlers-Danlos syndrome, Gardner syndrome, and Sturge-Weber syndrome.[68] Some systemic disorders which may result in hypodontia include Crouzon syndrome, Ectodermal dysplasia, Ehlers-Danlos syndrome, and Gorlin syndrome.[69]
Abnormality in size

Microdontia is a condition where teeth are smaller than the usual size, and macrodontia is where teeth are larger than the usual size. Microdontia of a single tooth is more likely to occur in a maxillary lateral incisor. The second most likely tooth to have microdontia are third molars. Macrodontia of all the teeth is known to occur in pituitary gigantism and pineal hyperplasia. It may also occur on one side of the face in cases of hemifacial hyperplasia.