Several studies have suggested capsaicin as a treatment for Morton's neuroma, is it a curative or a temporary analgesic treatment, how much time it lasts?
Capsaicin only desensitizes nerve cells in therapeutic doses. The process is reversible but may provide relief for long periods. I don't know about Morton's neuroma but I've heard that the relief may prolong for months in some cases.
I recommend reading Koivisto et. al. 2022 paper. Here is the doi: https://doi.org/10.1038/s41573-021-00268-4