How long do i have to keep braces on for? what factors decides the length of time?

Treatment objectives: Without an examination and work-up, it is not possible to give you a time frame. There is no set number. Your situation is unique and this question is best discussed with the orthodontist who will be treating you.

Until..........: Each case is different. Your age, degree and type of malocclusion, patient cooperation, individual variation, etc are must some of the contributing factors that determine the length of treatment. Orthodontist can usually give you a fairly accurate range of treatment duration at the consultation appointment following their treatment evaluation and workup. This assumes patient compliance.