Answers: You're orthodontist is really the only one who can estimate it. However, I will read aloud this. Don't rush it! When I was childlike and had braces, my orthodontist be pretty aggresive with getting my teeth fixed. 15 years following all that stress on my teeth have caused some of the nerves to die - that way a root canal.
I've have two root canals already, both on my front teeth. And because the root strait in the front teeth are so get thinner, most dentists refer you to a specialist. That costs a lot more.
So don't rush getting the braces rotten. In fact you may want to ask your orthodontist in the order of the effects of stress on your teeth. And if you're still thinking about getting braces, please don't agree to this throw you off. There's nil prettier on a person than a nice smile.
Only your orthodontist can enlighten you that. Because it's not ALL about the overbite.