There are several possible reasons why someone’s teeth may be out of alignment. Some common causes include genetics, habitual thumb-sucking or tongue-thrusting in childhood, incorrect swallowing or oral habits, and abnormalities in the jawbone or surrounding facial structures. In some cases, the teeth may become misaligned as a result of trauma, such as an injury to the mouth. It is important to see a dentist or orthodontist if you have misaligned teeth, as they can provide a proper diagnosis and treatment plan.