The aligners straighten the teeth by applying pressure from the specially designed plastic aligners, encouraging the teeth to move into a slightly different position each aligner at a time. Sequentially, one aligner at a time, the teeth move from crooked to straight teeth by applying the pressure on the teeth. It is important that the aligners are worn 20 -22 hours per day to allow the pressure to result in movement of the teeth. Compliance with wearing the aligners is the most important factor in the success of your Invisalign clear aligner treatment!