Abstract: The purpose of the present invention is to provide an oral composition that possesses an excellent teeth remineralization promoting effect and that is capable of effectively promoting teeth remineralization even when retained in the oral cavity for a short period of time. An oral composition in which (A) a calcium salt of organic acid, (B) a fluoride, and (C) a basic peptide and/or a basic protein in which 60% or more of the constituent amino acid residues are basic amino acid residues are added in combination is capable of dramatically promoting teeth remineralization as a result of a synergetic effect of these components and is capable of effectively promoting teeth remineralization even when retained in the oral cavity for a short period of time.