The failure rate of Invisalign is remarkably low when patients follow the prescribed guidelines, but “failure” usually stems from non-compliance rather than the technology itself. Clinical studies suggest that the treatment is effective in over ninety percent of cases for mild to moderate orthodontic issues. However, the success drops significantly if the aligners are not worn for the required twenty to twenty-two hours per day. When a treatment fails, it is often because the teeth did not “track” properly with the trays, or the patient stopped wearing them entirely due to the lifestyle changes required. In complex cases involving severe rotations or vertical movements, Invisalign might be less predictable than traditional braces, which is why a thorough initial assessment with an orthodontist is vital.