I am 25 years old. I've been wearing braces and an expander for 5 months 3 weeks and 4 days.
I understand that most adults who were told to wear an expander as an option to fix their crossbite, there would probably only be a 50/50 chance it will work. Am I the first adult on here who has actually experienced the expander NOT work? Most of the posts I've read on this site of adults who wore an expander say it worked for them (even a 40+ yr old if I remember correctly, nonsurgical). Most wore the screw-key type expander, I've only read a couple with a spring or the quad helix expander. Mine is a spring type, and probably the most rare:

I went to the ortho Monday for an adjustment and she gave me the news that my expander has NOT been working. Really ruined my day, actually it will probably ruin the rest of the time I'll be wearing braces. She also put a new bracket on my very last upper left molar, the same side of the crossbite (didn't have one there in the first place, after 6 months, ortho puts it on now??). For what reason, I don't know. I was still thinking about the words she said, "expander not working after over 5 months."
Anyways this is what my teeth look like now after about 6 months:

You can see the crossbite on MY left side in the pic clearly visible. If anything, it's actually more visible and worse then before (pre-ortho picture below). The bracket holding the expander in place on my second to last molar is clearly visible, whereas on the other side it disappears into my cheek. The other thing I notice, is the bottom arc on the same left side of my mouth seems to be going wide left...causing the crossbite to worsen. Can that actually happen??
I do have to wear an elastic (they told me it was the "lightest") on the same left side (no elastics on my other right-side).
So, the crossbite looks worse then when I didn't have any dental work done at all. I know braces can make your teeth worse before it gets better ..but in my situation, its the crossbite getting worse from what I see. And the most frustrating part about all this is, the ortho said in the next appointment if nothing happens in terms of expansion, she will take the expander off.. so she will take it off while the cross bite looks this bad????!!@
Here is my teeth prior to any ortho:

(bad quality picture, didn't have my camera at the time so i used my cell phone)
I can see movement for my front teeth in the past 6 months, but the crossbite is definitely worse. Actually in this pre-ortho work picture you can't even tell I have a crossbite. My crossbite was very minor in the first place. Compare my pre-ortho work to my present-ortho work picture above, and you can see a huge difference in the crossbite.
I still can't get over my frustration after sleeping on it yesterday.
I don't think I've ever heard anyone who had a crossbite see it worsen while wearing expander and braces. Anyone?