Everyone likes straight teeth, they look great and have many functional benefits.  Straighter teeth make chewing, biting and speech functions more effective. Jaw pain and TMJ issues are less likely.  There are many different types of malocclusion including overcrowding, crossbite, overbite, and underbite. All of these types of malocclusion can have negative impacts on the cosmetic appearance, but most importantly the functionality of the teeth.