Common orthodontic problems include crowding, excessive spacing, crossbite, open bite, deep bite, underbite, and abnormal eruption. Orthodontic treatment can correct these issues to improve functioning and appearance by properly aligning teeth and jaws. Crowding occurs when there is not enough space for teeth, while excessive spacing has too much space. Crossbite is when upper teeth are inside lower teeth. Open bite means upper and lower teeth do not touch when mouth is closed. Deep bite causes upper front teeth to bite deeply into lower front teeth.