Protrusion of jaw can be because of protrusion of teeth(dental) and/or protrusion of jaw bone. Braces have their limitation and can correct only dental protrusion. However if still you need further correction you have to go for surgical correction of the jaw bones.
Pl consult a good oral & maxillofacial surgeon & orthodontist. Frankly share your concern and before you decide discuss merits and demerits of the procedure and complete treatment plan.
In good hands, I am sure desired results can be achieved.
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