The primary objective of orthodontic treatment is the movement of teeth into a more ideal relationship, not only for aesthetic, but also for functional considerations. Another very important objective, often not given enough consideration, is the need to finish the case with the muscles of mastication in equilibrium. If muscle balance is not achieved, an endless procession of retainers is required for retention. In simple terms, if the occlusal forces in maximum intercuspation are unevenly distributed around the arch, tooth movement will most likely occur.Today, however, it is possible to simultaneously and precisely measure the relative force of each occlusal contact, the timing of the occlusal contacts and the specific muscle contraction levels.This tech-nological breakthrough represents a paradigm shift in thinking and may improve orthodontic stability.