My daughter had really straight teeth as a child. Now her adult teeth are coming through, they seem to be crooked. What's wrong?

Your daughter is developing one of the most commonly encountered bad bites called crowding. Teeth maybe poorly aligned because the dental arch is small and/or the teeth are large. The bone and the gums over the roots of extremely crowded teeth may become thin and recede as a result of crowding. Impacted teeth, poor bite and undesirable appearance may all result from crowding.