How can I fix my jaw after braces?

Sry for my English. What happened to me was that I needed braces because the jaw space was small for the size of my teeth, and one of my canines could not come out of the gums. When I went to the dentist, he removed the premolar from one side of the upper jaw, and the canine from the other side of the upper jaw, although its edge was visible. and he didn’t remove anything from the lower jaw. So the lower jaw became larger than upper jaw (i have underbite). Dentists said idk how to fix this …