Malocclusion means having crooked teeth or having upper and lower teeth that don't line up properly. It is usually caused by problems with the shape or size of the jaw or teeth. In most cases, malocclusion is only a cosmetic problem. This means that you may not like the way your teeth look. But when it's severe, it can cause problems with eating or speaking.
Orthodontic treatment can usually correct the way the teeth and jaws line up.