A crossbite occurs when your upper and lower teeth don’t bite together evenly. For example, your upper back teeth may sit inside the lower teeth when you bite together like in this photo. This can adversely affect the growth of jaws in young children. If this bite is left untreated the lower jaw can grow off to one side.
Having crowded teeth is very common and often occurs when the jaw size doesn’t match the size of the teeth coming in so there isn’t enough room. It can also be created by baby teeth not falling out soon enough to allow room for the adult teeth. Overcrowded teeth can be harder to keep clean as it’s more difficult for toothbrushing between the teeth.
Impacted teeth are high up in the gum line and not coming through as they should either because they are immobile and have stopped moving or because there isn’t enough room for them to erupt into their proper position.
Some people are born with a tooth or teeth missing, or alternatively it can be the result of an early accident when a tooth or teeth is lost. When there are large gaps caused by missing teeth the adjacent teeth on either side can start to drift into the wrong position or the unopposed matching tooth on the other jaw can over-develop into the empty space. This usually creates very visible gaps when smiling and can lead to bite problems.
An overbite (or deepbite) is where the upper front teeth bite down too far over the lower front teeth. In severe cases, front teeth can become severely worn down and the lower teeth can cause damage by biting up into the gum behind the upper teeth.
An overjet occurs when the upper teeth protrude or stick out over the lower teeth. It can also be caused by the lower jaw not growing forward enough. Teeth that protrude or sit out too far can be at increased trauma risk if they get knocked in an accident.