In her 20s, my wife had braces, mainly to fix her 2 front teeth. The treatment included removable expanders (not to expand the palate, but to help move teeth backwards), fixed metal brackets, and headgear.
For me, it was great, although I never dare let on that I had a "thing" for braces.... my wife is very straight-laced, and would find the idea of a braces fetish to be weird and maybe close to gross.
She never kept on with wearing her reatainers, and now, 30 years on, she has a similar problem with her teeth: the top front one are both twisted outwards, plus the lowers are a bit crowded.
So, I was amazed and pleasantly surprised when tonight she told me that she was considering having orthodontic treatment. Of course, I had to do my best to pretend not to know too much about braces, yet at the same time, encourage her.
The even better thing, from my perspective, was that she said that, whist she was aware of "invisilign", because she was hardly in a public-facing job, she feels that she will probably go for "train tracks".
So, she is going to ignore her dentist (who pointed her to a single local orthodontist) and plans to see maybe 3 orthodontists to see what they suggest!
I wonder if she'll get headgear again? I n a way, I rather hope she does!