Why should complex dental cases be planned for completion within one to two years maximum? Because longer treatment timelines invite life events that derail the case, and clinical conditions degrade over extended staging in ways that compound problems faster than the staged plan addresses them. The dental treatment timeline limit of one to two years is not arbitrary. Patients' lives change in ways that interrupt treatment: job changes, relocations, family events, financial shifts, health changes, simple fatigue with the treatment process. The longer the planned treatment extends, the higher the probability that one of these events disrupts the schedule before completion. [...]