Posture corrector product: how effective are these?how many hours per day should they be worn and how many weeks before posture is finally corrected? should you wear these to sleep?

Posture corrector: Posture correctors are worn only during the day and serve more as a reminder to keep you shoulders back and your chest out than anything else. They do not stimulate muscles or do any other physiological thing that will straighten your back. You can wear them as much as you can tolerate. Good posture is important and can dramatically ease back pain or other symptoms.