He does functional orthodontics which means he takes the entire face into account not just the teeth.
He will reverse the retraction that was done after extraction of teeth.
Extraction of teeth for braces causes underdevelopment of the entire lower half of the face, stunting it's growth with steel.
Functional orthodontics can staighten teeth without extractions, or,
As in my case , attempt to expand the arch again, allowing your lower face to develop the way it should have.