"I would certainly recommend anyone who has crooked teeth should consider any type of faster braces treatment BEFORE considering porcelain veneers"
-Michael Y. Zuk DDS.

This is an actual before (image on the left) and after (below) set of photographs for a patient that was treated in only 3 1/2 -4 months. While treatment times will vary depending on the situation and the treatment abilities of the dentist, this type of improvement is an example of "extreme orthodontics" that was once thought to be impossible. Further information about this kind of treatment is available if you simply Google the term "High Speed  Braces"