The easiest way for someone to prove they are cured is to post a picture of their tongue. If someone has an easy and valid way other that this then let's hear it.
A pic of the tongue proves nothing. I have distilled water fasted for 40 days. My tongue was normal and flesh colored after the forty days, but white in color after just a few days, or a week.
In addition, a person can think in terms of being cured after doing some protocol that relieves certain health issues. "cured" is subjective to the individual and should be considered "opinion" rather than fact needing proof.
People post what they used, or did to help others that might have the same issues, or similar. The readers can decide for themselves whether to do the same.