The adsorption and lubricating behaviors of human whole saliva on dental ceramic surface were studied using nanoscratch technique.The absorption mechanism of salivary proteins on dental ceramic surface was analyzed.Results show that a uniform dense salivary pellicle is formed on the surface of dental ceramic after 1 min in vitro adsorption treatment with human whole saliva,which shows quite good absorption behavior of human whole saliva on the dental ceramic surface.Test results of adhesion strength show that the adhesion strength between salivary pellicle and dental ceramic surface is very close to that between salivary pellicle and human tooth enamel.Human whole saliva has quite good adsorption behavior and adhesion strength on the dental ceramic surface,which can significantly reduce the friction coefficient and wear volume of dental ceramic surface during its service process,and provide effective lubrication to ceramic surface.The electrostatic interaction between salivary proteins and dental ceramic is the main cause for the dental ceremic surface to possess good absorption behavior and quite high adhesion strength.