L.B.
Hi!
My daughter had a really bad underbite and started phase 1 of her braces at age 8. The ortho wanted to wait until all her baby teeth fell out first. She is now 14 and went through 2 phases of braces. I am happy to say her underbite is gone and she has beautiful teeth. I think it's a great idea to get a 2nd opinion.
Good Luck!
L.