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Fixed prosthodontic treatment can offer exceptional satisfaction for both patient and dentist but failure may occur at any time right from diagnosis to treatment phase which can be frustrating. The dental literature is lacking in classification of failures in Fixed partial dentures. The cause may be that signs and symptoms of failures are varied and often complex and there is the additional problem of reaching a common interpretation among investigators on the definition of failure. When dealing with failed or failing fixed restorations, proper knowledge of diagnosis, assessment of the clinical condition and technical skills are absolutely necessary. Hence it is important to be aware of obvious and subtle indications of prosthesis failure and have a working knowledge of the procedure that are necessary to remember the situation. This review focusses on classification systems of failures associated with tooth supported fixed partial denture proposed by different authors.