Scissors bites describes a problem when the back teeth are displaced so far towards the cheek or tongue side that the biting surfaces miss each other completely. Just like how the cutting edges of a scissors shear past each other. Scissors bite leads to unnatural wearing out of teeth surfaces and with time, the affected teeth will grow past each other and you could eventually lose them!
Scissors bite reduces eating efficiency and causes problems with cheek biting, difficulty in cleaning and potential gum disease.
A crooked face may not always be due to a skeletal problem. Scissors bites and cross bites may cause an unnatural interfernce during biting, leading to an unnatural jaw shift to a side.