Dental crown and bridge facing fracture in the patient mouth are true frustration for both the patient and the dentist, a review of this clinical causes of this problem, whether are technical or clinical, is done. However, it is considered as a frequent problem in the dental clinic, a review of the different option for treating this problem is exposed. spite of the sophisticated structure of the hard tooth tissues, enamel and dentin are prone to extended damage in the oral cavity. However it is a real challenge to find a man made materials that compete with these hard tissues.