Common conditions that could need early intervention are:
- protruding teeth - front teeth may stick out and be prone to fracture
- crowding or narrow tooth arches - expansion of the palate can crest more room for the larger adult teeth
- underbite - the bottom jaw come out ahead of the upper jaw
- crossbite - some bottom teeth protrude in front of the top teeth
- open bite - the front top teeth do not touch with the bottom teeth when biting down
- thumb sucking or tongue thrusting - habit breaking appliances can help