Glass ceramics are the benchmark in the aesthetic rehabilitation of anterior teeth in the field of Prosthodontics. To practically apply the knowledge in clinical practice we need to understand the composition and crystalline structures of the Ceramics thoroughly. Classification of Glass Ceramics includes Fluourapetite, Leucite based and lithium Disilicate based Ceramics. Processing of Ceramics ranges from Heat-pressed to CAD-CAM system. Monolithic and Layered Glass Ceramics are two options of restoration available and can be chosen according to the clinical scenario of the patient.