I know they are expensive, but do try to use them for a time period of at least 2 weeks to a month.

I found that after my remission (my nerve was damaged from a C-section where an exploratory was also done to look for ovarian tumors and kidney tumors)... heat can reactivate the pain briefly now. Hot tubs, steam room, or heating pad will cause the nerve to "wake up". But those did not cause lasting trouble just "twinges" for a day or so. But the searing pain I had (like 100 bee stings or a lightning bolt) did remit. I am left with some mild numbness over the thigh, but that is really mild and not troubling.