Can braces widen my smile and make my face look rounder? (Photos)

Before braces I had a very long and heart shaped face but after I got them, my face appears much rounder and the chin has also reduced to a great extent. I got them at the age of 23 and the doctor refuses to accept that it's because of the braces. She says that it's impossible to do so, even if they wanted to because I am at an age where the bones cannot expand.