Determined by gentle to moderate malocclusion (outlined as crowding and spacing as much as 6mm, and overjet and overbite around 6mm and assuming one week use), treatment periods fluctuate based on Invisalign products form, dress in time, scenario complexity and should be based on your physician. Chen and Dr. Corlovsky. https://emilioczupk.total-blog.com/detailed-notes-on-invisalign-surrey-53862773