Temporomandibular joint disorders is the term used to describe a wide range of disorders affecting the temporomandibular joint. the treatment varies from nonsurgical to surgical treatment modalities. However, the cases with TMJ disorders are not usually straightforward cases, especially cases with previously failed treatment. The concept of system failure hypothesized by Prof. Hegab with functional rehabilitation of the joint regardless the disk position showing promising treatment results. The aim of the current lecture is to discuss the consequences of improper treatment of TMJ disorders and its management.