Objectives: The presentation deals with some beneficial features of nanostructural chemically bonded bioceramics in the system CaO-Al2O3-SiO2-P2O5-H2O (CASPH). Nanostructures are easily formed in the CASPH-system due to low solubility products of the phases formed. Methods: The materials were synthesized by Doxa AB. Jet-milling was used to obtain fine-grained original particles. Added phases were glasses or ZrO2 and SiO2 depending on the applications aimed at. For early hardening, a glass ionomer was used. Mechanically related properties (flexural strength, compressive strength, fracture toughness and Youngxs modulus) and biologically related properties (biocompatibility, bioactivity, tissue integration and antibacterial properties) were evaluated using ISO Standards. Properties related to dimensional stability over time and general thermal properties were also examined. Results: The nanostructures contribute to high mechanical strength, and complete sealing of contact zones to surrounding materials. Practically related properties deal with 1) Nanostructural integration with reduced risk of secondary caries and restoration failure, 2) Dimensional stability (no shrinkage) and reduced post-operative sensitivity, 3) Environmental friendliness, 4) Moisture tolerance, and 5) Excellent retention towards different types of tissue and biomaterials. The CASPH-based biomaterials are close in chemistry to apatite, and the thermal and electrical properties are close to those of hard tissue. A unique combination of properties is the simultaneous appearance of bioactivity and antibacterial properties. Conclusions: The properties found in the system CaO-Al2O3-SiO2-P2O5-H2O (CASPH) meet all the desired properties asked for in the textbook by van Noor, “Introduction to Dental Materials”, which are biocompatibility, dimensional stability, antibacterial features and bioactivity. Supported by Doxa AB, Sweden.