It was called a MARA device, and I think it was pretty new technology, so it might have only been available recently. Although I'm not positive it did the same thing as headgear - did headgear force your lower jaw forward to fix your overbite too?
you said it yourself
there are younger users on this site who may still believe in santa claus
don't be 'lazy' and just put some spoilers over the parts that mention not believing in santa
it's called being considerate