Lack of space: Some people have more teeth than the 32 we are supposed to have, and these teeth sometimes have no room to come in between teeth, and they grow on top of gums. This however, is more common with teeth that are not extra but do not have room to come in due to smaller jaw bone space or due to retained baby teeth that are occupying the space.
Answered 5/6/2015
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Genetics: The way teeth develop and erupt is determined by your genetic code. Severe trauma, intense medications, and other drastic environmental factors can sometimes alter your genetic programming, but that is very rare. If you lose baby teeth too early or out of order, that can change things. If you have a tooth which is coming in crooked or in the wrong place, that's usually just the way you developed.
Answered 9/14/2013
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