Gm....it's a very good decision to have braces for your teeth, so as to have a functionally and aesthetically pleasing teeth.On average, treatment duration with braces is 11/2yrs.It may take even lesser in less severe cases or may take more time in severe cases. Only after reviewing your case the orthodontist will be able to tell you the tentative treatment time, the treatment plan and treatment modality best suited for your age and lifestyle e.g. Invisible braces etc.So go visit an Orthodontist as soon as possible.

Duration of treatment depends upon the severity of problem.. minimum 8months... please see an orthodontist