by in FAQs How long will treatment take? How long will treatment take? Each orthodontic case is unique. Definite corrective treatment lasts approximately two years (+/- 6 months) for most cases. Depending on the severity of the case, treatment may last longer. Share: previous post APO Triple Event: APO and PBO Induction of Officers, and Christmas Party next post Our 5th Biennial Regional Orthodontic Congress