Editing Human tooth (section)

==== Abnormality in number ====
* [[Anodontia]] is the total lack of tooth development.
* [[Hyperdontia]] is the presence of a higher-than-normal number of teeth.
* [[Hypodontia]] is the lack of development of one or more teeth.
** 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's syndrome]], and [[Sturge–Weber syndrome]].<ref name="neville70">{{harvnb|Neville|2002|page=70}}</ref> Some systemic disorders which may result in hypodontia include Crouzon syndrome, [[Ectodermal dysplasia]], Ehlers–Danlos syndrome, and [[Gorlin syndrome]].<ref name="neville69">{{harvnb|Neville|2002|page=69}}</ref>