There are many reasons why teeth can be misaligned. Some people have a mouth too small for the size of their teeth. The relation between the arches can also be incorrect.
Premature loss of baby teeth;
Trauma to the face;
Bad habits, such as thumb sucking.
Teeth are harder to brush thoroughly;
Stress on the teeth, jaws, or facial muscles;
Abnormal facial appearance;
If not treated, a cavity formed by decay grows to reach the pulp and eventually destroys the tooth structure creating an infection which in turn causes an abscess.
An orthodontic examination should be performed to determine proper treatment.
Since this problem is mostly hereditary little can be done for prevention. Although if treated in its early stages, the outcome can be much more favorable.
An orthodontic examination should be performed to determine proper treatment