There are many potential factors involved. * Congenital hypopituitarism * Ectodermal dysplasia * Down syndrome * Ionizing radiation to the jaws during tooth development (odontogenesis) * Chemotherapy during tooth development * Marshall syndrome * Rieger syndrome * Focal dermal hypoplasia * Silver-Russell syndrome * Williams syndrome * Gorlin-Chaudhry-Moss syndrome * Coffin–Siris syndrome * Salamon syndrome * Cleft lip and palate Others include trichorhinopharyngeal, odontotrichomelic, neuroectodermal and dermo-odontodysplasia syndromes.
Microdontia
Microcoria
Macrostomia
Macrotia
Micromastia
Brachyphalangy
Iniencephaly
Macrocephaly