@Diane,
Thanks all.
Reassuring, especially patiodog.
She's getting braces for sure... this particular procedure (palate expander), a precursor to braces, was one that I was questioning. When I was researching, it seemed like it can be used as a replacement for having molars extracted, or just
time. (Letting the jaw grow so that there is more room.)
However, I saw the orthodontist yesterday and he answered my questions satisfactorily, so we'll be going ahead with it soon.
Her main problems that need addressing are the crossbite (cosmetically not particularly noticeable, but with some actual medical permutations... overbite for the front teeth, underbite on the sides) and canines that don't have room to emerge (just like that puppy, though no ill effects yet except that they're not there). (She has lost all of her baby teeth and every adult tooth except for the two canines has emerged.)
What started this train of thought though is that I did a BUNCH of research online yesterday before the ortho appt., like several hours' worth. First I did some follow-up research on palate expanders (I'd already done the basic research) and found some horrifying things. (Shape of face changing. Copious amounts of saliva the whole time you have it in so you spit on people whenever you talk. Horrible headaches. Cuts on tongue from the device. Gagging when tightening the key. TMJ. Etc., etc.) Then I had to do a bunch more research to counteract the more extreme stuff. (Most of the time, it's not a big deal, and the bad stuff usually resolves within a few days.)
However... during all that reading, I kept seeing over and over again people freaking out on behalf of themselves or their kids on how horrible it was, and being reassured with (or reassuring themselves with) "but it will look so pretty when it's done, it's worth it." Some of them talked about crossbites and medical stuff, the vast majority of them -- and that added up to quite a bit -- were all about the pretty.