Overall, non-metallic posts show a lower incidence of root fracture due to their ability to resist high stress without permanent deformation and breaking. Non-metallic posts should not be used if there is insufficient sound tooth tissue (ferrule). The sound tooth tissue should be at least 1.5 mm circumferentially further apical to the core. Non-metallic posts are also more aesthetic than metal posts as metal posts will shine through all-ceraminc restorations and non-metallic posts' optical properties are closer to tooth tissue (except for carbon fibre posts due to the darker material). Non-metallic posts are easier to remove from teeth if needed than metal posts. Direct use of non-metallic posts in the most common use but they can also be built up in the laboratory.