When patients present to the dental clinic for retreatment, there is little room for error. Cases requiring retreatment may have already result- ed in complications, failures, and even iatrogenic damage. It is therefore in the best interest of patients and for the discipline that clinicians share protocols, techniques, and innovations used in retreatment to improve the quality of care and avoid further error. The clinical cases depicted in this DVD compendium all lay bare two things: first the medical mistake and then the innovative fix that allowed for a successful outcome at retreatment.