Octacalcium phosphate is a calcium phosphate mineral with the chemical formula Ca8(PO4)6(OH)2·5H2O, commonly found in bone and dental tissues. It plays a crucial role in biomineralization and is significant in the development of bone graft materials and dental treatments, as it can enhance osteoconductivity and promote healing. A key association is its presence in dental calculus, which can contribute to periodontal disease if not managed properly.