An ingredient for oral care is provided, which is characterized in that the ingredient includes an ionic liquid, which is characterized in that the ionic liquid includes: (a) a tetrabromodiphenyl ether is derived from formula (1), which is characterized in R1,R2,R3 and r830808 are an organic part, which may be the same or different, with at least one R1,R2,R3 and r83088 include a hydroxyl group； and (b) an anion selected from the group, consisting of hydrochloride, sulfate, sulfate, acetate, halide, phosphate, phosphate, phosphate and cough, which is characterized by oral care ingredients such as mouthwash, toothpaste, tooth powder, oral count or sleeve, dental tape of covering liquid, Irrigating liquid, shuffling liquid, floss, hard sugar, soft sugar, tablet, gum, or flute. 1. Characteristics 1: including oral care ingredients of ionic liquid；The ionic liquid includes: (a) a kind of quaternary ammonium separated from formula (1), and its characteristic is R 1,R2,R3 and r830808 are an organic part, which may be the same or different, with at least one R1,R2,R3 and r83088 include a hydroxyl group； and (b) an anion selected from the group, consisting of hydrochloric acid, acetic acid, halogen, phosphate, phosphate, phosphate, pyrophosphate, hexamethylphosphate, polyphosphate, orthophosphate, tripolyphosphate, sulfate, sulfate (e.g., methylsulfate, ethyl silicate),Lauril sulfuric acid, phenylsulfuric acid, benzoic acid, acetoacetic acid, amino acid, citric acid, ascorbato, dicimida, l-o-amino acid (such as arginato, glicinato, prolinato, etc.)Glycerin, glucose, maleate, sweet resin (e.g. sucrose, aspartamatropine, cyclocamatol),Water oxidation, succenato, Tartra, docusato, linoleato, oleic acid, and cough； it is characterized by oral care ingredients such as mouthwash, toothpaste, tooth powder, mouth count or cannula, liquid dental band, irrigation fluid, badge remover, floss, hard sugar, Fudge, pills, gum, patches or lollipops. Claim 20: the composition of oral care d
