[loceng]

Lookup the term "mewing" - apparently jaw changes after age 25 are difficult but apparently not impossible.

I'd recommend watching this interview between John Mew (orthodontist) and Bret Weinstein too: https://youtu.be/JYpPu-NrYSI

[amelius]

I remember seeing this but I still don't know if it's a hoax or not.

[criddell]

I wonder if that could help with tinnitus?