Hoe safe and effective is chiropractics? is there sufficient evidence that shows it is truly effective?

Safe for Spinal: Chiro base their treatments on theory that if the bones in your spine are out of alignment, that can cause many medical problems, especially of the nervous system most of them believe medicines and surgery should be the treatment of last resort some also use herbal therapy, nutritional therapy, physical rehabilitation and physical therapy. Effective for back neck pain, no evidence for other conditio.