Will my hair color fade?

I have natural black hair. I dyed it for the first time a few days ago at Aveda to a medium brown (permanent). Everything came out fine except for my roots, for some reason those came out orange/red, like a ginger. The stylist went ahead and put a brown demi color over where it was orange and the color looks perfect. My fear is that because the brown is demi it will fade and I will get stuck with the orange. Will this happen? Will I have orange hair? Will the orange fade away? Also, does Aveda permanent color fade? and if it does, to what color?