Hi all!
I also want to share my experience. I have both canine impacted in palate. When I started my braces treatment, both canine were inside the palate (left canine is horizontal, right canine is vertical). About 4 months of braces, the right canine started to come down alone without surgical exposure and without braces, alone! (money and pain I save

!). At my 8 months of braces, I did the surgical exposure to the left canine impacted, It didn't latest nothing, the surgical took about 5 min. (when I went, I think it would take about 15 min., but no). The maxillofacial also removed me the left baby canine. (the surgical cost 120€ -> 150$)
After a week, I went to the orthodontist, and put me the bracket in both canine. The orthodoncist said me that: "I don't know if the canine will come down, that is something that we'll see with the time, 'cause some impacted teeths are so stick to the bone, but you are young, so we hope it will come down". The orthodoncist said also: "The surgical exposure is perfect! That Dr. it's a genious!"
This is my 3th day after putting the braces on the impacted canines, so It still hasn't moved. I will notice here in a few months.
Bye!
P.D: Sorry for my english, I'm from Spain.
