The average Invisalign treatment lasts between 12 and 18 months, though some minor cosmetic fixes can be completed in as little as six months. The total duration depends on how far your teeth need to travel and how complex your bite alignment is. During your initial consultation, your dentist uses 3D mapping software to plan every movement, giving you a fairly accurate estimate of your timeline. It is important to realize that the initial set of trays is often followed by a few months of “refinement” of aligners to perfect the final position of stubborn teeth. After the active phase is over, you will need to wear a retainer at night indefinitely to ensure your teeth stay in their beautiful new positions.