Orthodontic treatment can prevent further problems in the future. Problematic teeth will be harder to clean and that means painful gums and your teeth will wear out by unnecessary abuse due to wrong positioning.
Another reason is that having your teeth fixed may help avoid developing a breathing problem. Teeth that are not aligned or positioned properly can affect the roof of your mouth. If it starts to block the air passages in your nose, you get breathing problems and not to mention snoring problems. Speech can also be affected. It has been known that certain lisps are affected by the positioning of the teeth.