Braces for 8 year olds?

Hi There,
Anyone have any words of wisdom when braces are recommended for an 8-year-old?
There is a lot of conflicting reactions and discussion out there, and it's making me lose my confidence.
I did some online research last night regarding my daughter's underbite, and it appears, when it's a skeletal issue, braces are one way to move the jaw. Its recommended to do this early (age 8). Still, headgears, pallate expanders and surgery may be done. I can't fine anything that says children outgrow an underbite.
Any words of wisdom from those of you who have been through it?
Carrie Wattu, editor