In 1945, Dr. H.D. Kesling envisioned that one-day modern technology would enable the use of a series of tooth positioners to produce the kinds of movements required for comprehensive orthodontic treatment. Technology has made this vision a reality. Using advanced computer technology, Align Technology produces Invisalign, a series of customized clear appliances, or aligners. Each aligner is worn sequentially by the patient to produce extensive tooth movements in both upper and lower arches.