This document discusses bridge failures in dentistry. It defines manifestations of failure such as pain, inability to function, and inflammation. Causes of failure include improper case selection, faulty diagnosis, and poor patient maintenance. Failures are classified as biological, mechanical, or esthetic. Biological failures involve issues like caries, pulp injury, periodontal breakdown, and tooth fractures. Mechanical failures include looseness, fractures, and wear. Esthetic failures occur immediately during cementation or are delayed due to issues like recession or discoloration. The document stresses avoiding failures through careful planning, addressing preoperative problems, and considering re-treatment options like temporary cement. It presents two case examples of bridge failures managed through treatments like root canals