If you dream of braces on your teeth, then you are working to improve your communication skills.
If you dream of braces on your legs, then you are learning to stand up for yourself.
If you dream of a back brace, you are learning to stand up straight, to be proud and confidant.
If you dream of braces for a building, this is about an attempt to stabilize the foundation of your life. See Teeth and Mouth.... Strangest Dream Explanations
(If you really have braces, you’re probably just dreaming about them!)... My Dream Interpretation