These shift your teeth into a new position gradually over time. Traditional metal braces often take an average of two years (24 months) to achieve their full effect. My 1st 6 Months On Invisalign In 2021 Invisalign 6 Months Months More complicated cases that require the movement of stubborn back teeth could take up to two years.a good rule of thumb our to follow is that the average invisalign treatment will take approximately 12 months. How long till invisalign works . The invisalign process is a cosmetic dental procedure that involves fitting your mouth with a series of clear trays. People often wonder when when does invisalign stop hurting? The only time you’re supposed to remove the aligners is when you’re: Most people start noticing some movement, however, within the first two months after getting their first set of aligner trays. Your invisalign doctor will determine exactly how long your treatment could take based on your specific needs. The long and short of it is t...