Yet, in the seventies it was done. The proof is irrefutable. That does not mean it was a good idea and time was measured in months, not years.
I doubt if it is done today but for some unfortunates back in the day, they had no choice.
My ortho wanted full time wear and used parental pressure to accomplish as much wear time as he could coerce out of his patients. And for some of his patients that worked, some kids wore them to jr high school, some older patients, such as myself, tried to squeeze wear time in without going public, but sometimes we just wore the damn things, pride be damned.