In this case, the teeth are crowded with poor alignment. The front teeth are also lacking overlap.

In this case, the bottom front teeth are ahead of the upper front teeth, also called underbite.

In this case, the back teeth on the right are in "crossbite". The front teeth are poorly aligned. Also, note the discrepancy between the middle of the top teeth and the middle of the bottom teeth.

The two front teeth have a large space or diastema between them. Non-orthodontic solutions to this problem result in making teeth bigger.

This case has significant crowding of the bottom teeth, resulting in gum health issues.