Multiple reasons: Crooked teeth have multiple causes, including but not limited to too-size/jaw-size discrepancies, gum and bone support problems, improper eruption pattern of the teeth, untreated decay between teeth, etc. For an informed opinion, see an orthodontic specialist such as dr guy coby in quakertown where you live.
Answered 6/24/2013
5.4k views
Etiology: Crowding causes are multi-factorial. Genetics: evolutionary reduction in jaw size & increased outbreeding. Environmental factors (i.e., diet, mouth breathing, orofacial muscles, habits, thumb-sucking, etc.).
Answered 4/11/2015
5.2k views
Braces: Crooked teeth are due to genetic and enviromental problems. Maybe your parents had them or you sucked your thumb.
Answered 3/26/2017
4.9k views
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