A brace all by itself will not heal your back. Supportive braces can help, especially if you have severe pain. However, long-term use of a brace can lead to a weakening of muscles around the spine. This can make your problem worse.
You may need the support of a brace, but don't wear it for long periods of time. Take it off to do gentle stretches and exercises prescribed to you by a doctor or therapist. They can also suggest ways to control your pain, including cold and heat treatments and medications. All these therapies together can help heal your back. Don't depend on just one method of treatment.