The invention discloses anti-caries and antiallergic mouth wash, which belongs to the field of oral cavity care. The anti-caries and anti-sensitive mouth wash comprises 0.02 to 0.06 mass percent of ammonium fluorosilicate, 0.03 to 0.05 mass percent of cetylpyridinium chloride and auxiliary ingredients such as a moisturizing agent, a surfactant, a preservative and the like. Compared with the conventional antiallergic mouth wash, the anti-caries and antiallergic mouth wash has the advantages that: the ammonium fluorosilicate serving as a functional material is added into the mouth wash, so the antiallergic effect is more obvious and durable; the mouthfeel is good; the anti-caries and antiallergic mouth does not comprise alcohol, so the alcohol carcinogenic danger is reduced and the anti-caries and antiallergic mouth wash is safer; side effects such as teeth discoloring and the like are not generated; and anti-caries and antibacterial effects are achieved and oral health can be maintained better.