Well, I am 16 years old and have the same problem. But to me, it's my right upper canine tooth which is not erupting by itself...
What my dentist did, was to just cut up my gums, so that the tooth was exposed. He removed a little gum and I bled a lot in the dentist chair

But to be honest, the procedure was not so bad as it sounds!
I am wearing headgear now, and if the tooth does not come down by it self before July, I am going to wear real braces... Hope not
