I am unable to fully heal from sores, knee surgery, root canal, surgery. what should i do?

Check immune system: An immunology workup may reveal why you seem unable to heal. If you have persistent sores, there can be nutritional or genetic issues. If you get infected easily, and can't fight infections, that's another issue. Sometimes the reason may be relatively simple, but often very specific and complex tests are needed to shed light on the problem. That is why a specialist is your best bet.

Check for diabetes: People with diabetes have healing problems due to what we call poor peripheral circulation. While there can be other reasons for poor wound healing, this would be the first thing to look for.