There is evidence of hereditary factors along with some evidence of environmental factors leading to this condition. While a single excess tooth is relatively common, multiple<unk>  is rare in people with no other associated diseases or syndromes. Many supernumerary teeth never erupt, but they may delay eruption of nearby teeth or cause other dental or orthodontic problems. Molar-type extra teeth are the most common type. Dental X-rays are often used to diagnose<unk> . It is suggested that supernumerary teeth develop from a third tooth bud arising from the dental lamina near the regular tooth bud or possibly from splitting the regular tooth bud itself. Supernumerary teeth in deciduous (baby) teeth are less common than in permanent teeth. Related conditions<unk>  is seen in a number of disorders, including Gardner's syndrome and cleidocranial dysostosis, where multiple supernumerary teeth are seen that are usually impacted. Other associated conditions are: Cleidocranial dysplasia, Ehlers–Danlos syndrome Type III, Ellis–van Creveld syndrome, Gardner's syndrome, Goldenhar syndrome, Hallermann–Streiff syndrome, Orofaciodigital syndrome type I, Incontinentia pigmenti, Marfan syndrome, Nance–Horan syndrome, and Tricho-rhino-phalangeal syndrome Type 1.
Hyperdontia
Hypodontia
Anisomastia
Micrognathism
Microdontia
Anodontia
Iniencephaly
Microorchidism