PROBLEM TO BE SOLVED: To provide a composition for oral cavity improved in dentin caries inhibitory effect.SOLUTION: There is provided a composition for oral cavity which comprises (A) component: one or more lactam compounds selected from the group consisting of pyrrolidone carboxylic acid, 6-oxo-2-piperidine carboxylic acid, 3-(2-oxo-1-azepanyl)propanoic acid and a sat thereof, (B) component: a water-soluble divalent metal salt and (C) component: a water-soluble fluorine compound. A hydroxycarboxylic acid and/or a salt thereof are preferable as (A) component, one or more water-soluble divalent metal salts selected from the group consisting of a magnesium salt, a zinc salt, a copper salt and a strontium salt are preferable as (B) component and sodium fluoride or sodium monofluorophosphate is preferable as (C) component.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT
