Hi, Thank you for providing the brief history of you. As mentioned by you, that you have radiating pain in the legs , tooth ache, you even had leukemia. Now, for back pain, a thorough assessment is needed to come closer to the diagnosis. Usually, this symptoms arise due to lumbar spine soft tissue pathology. Performing an Straight leg raise will help assist to guide for an MRI of lumbar spine. By performing the MRI, the extent of the soft tissue injury can be mentioned and the nerve impingement can also be determined. Also, with the help of proper rest, medication and physical therapy 99% of the recovery is achieved. For toothache, you need to visit a dentist and then get it checked. Keeping a dental hygiene is of utmost importance as we consume food through the mouth and the hygiene of the mouth is of utmost importance. Getting regular dental checkups help avoid infection in mouth and passing through it to the stomach. Also, as you had leukemia, you need to perform general body exercises, breathing exercises and specific exercises for back ache. Benefits of this exercises are , they will improve the metabolism and immune system. Also, due to improved metabolism and improved immune system, the body stays detoxified which will help for overall good health. Regards Jay Indravadan Patel