I was diagnosed of 6mm overbite. i dont have any other complications apart from the overbite. i have spacing in my upper teeth, so i do not need extraction. is it possible braces is kept only on my upper teeth?

The orthodontist who will be treating you after examining you can better address your question(s). Although treatment of one arch is sometimes possible, both arches are usually treated to provide you with a more esthetic and stable result.

It may be possible, but not necessarily wise. Is your 6mm discrepancy a horizontal overjet or aa vertical overbite? If vertical are your lower anterior teeth over erupted? Are the spaces caused by malpositioned teeth, overly narrow teeth, or both. Treatment usually proceeds faster, with a better end result, if both arches are treated, Please see aa qualified specialist Orthodontist.