An open bite is where the front teeth do not overlap the lower teeth. This is caused by oral habits like finger sucking, tongue thrusting, or when the jaws don’t grow evenly.
Normally, there should be some kind of overlap but when the upper front teeth protrude over the lower front teeth such that they do not touch at all; which can result in an overbite.
When one or more upper teeth bite on the inside of the lower teeth, this condition is called a crossbite. This can happen on either one or both sides of the jaw & affect front or back teeth.
When teeth that are crooked & overlap mainly due to lack of space, this condition is called Crowding. Some of the causes include improper eruption of teeth, or when teeth are larger than the space available in the jaw.
This occurs when there are gaps between the teeth and is the opposite of crowding. This can occur between two or more teeth and can be caused due to missing teeth, smaller teeth or oral habits like tongue thrusting, thumb sucking.