<unk>  is a condition in which teeth appear smaller than normal.  In the generalized form, all teeth are involved.  In the localized form, only a few teeth are involved.  The most common teeth affected are the upper lateral incisors and third molars. The affected teeth may be of normal or abnormal morphology.
Microdontia
Micromastia
Iniencephaly
Macrocephaly
Acrania
Microcephaly
Elfin facies
Acephaly 