The invention relates to composite materials comprising calcium salts, such as calcium phosphates and calcium fluorophosphates, which are poorly soluble in water, whereby the calcium salts are provided in the form of nanoparticular particles having an average particle diameter ranging from 10 to 300 nm. The inventive composite materials also comprise protein constituents selected from proteins, protein hydrolyzates, and protein hydrolyzate derivatives. Said composite materials are suited for use as remineralizing constituents in compositions for cleaning and caring for teeth as well as for promoting the regeneration of bone tissue.