I had a back pain that wouldn't go away, and numbness in my arm. I went to a recommended chiropractor and politely told him I did not want to be one of those people who had to keep coming back. Fix me, or send me elsewhere.
He X-rayed, etc. He told me what the problem was, he told me how many sessions it would take to completely fix it (4 max). He did three sessions in 8 days, and I've never been back. That was over 5 years ago.