1. An oral care composition for use in the treatment of hypersensitivity to dentin, which is a liquid at room temperature or lower and which forms a two-phase opaque system at body temperature, where the composition contains a water-soluble non-ionic polymer having a cloud point in the composition at temperature not higher than about 38 ° C. 2. The oral composition according to claim 1, wherein the non-ionic polymer in the composition has a cloud point in the range of 32 ° to 38 ° C. An oral care composition according to claim 1, further comprising one or more cloud point modifying agents. An oral care composition according to claim 3, wherein the cloud point modifying agent comprises salt or a humectant or a mixture thereof. The oral composition according to claim 4, containing salt. The oral composition according to claim 5, wherein the salt is present in an amount in the range from 0.1 to 10% by weight, based on the weight of the composition. The oral composition according to claim 4, wherein the salt is present in an amount in the range from 0.1 to 5% by weight, based on the weight of the composition. An oral care composition according to claim 4, wherein the salt contains sodium citrate. An oral care composition according to claim 4, comprising a moisturizer. The oral care composition of claim 9, wherein the moisturizer is present in an amount in the range of 1 to 40% by weight, based on the weight of the composition. An oral care composition according to claim 9, wherein the moisturizer is present in an amount in the range of 2 to 10% by weight, based on the weight of the composition. An oral care composition according to claim 9, wherein the humectant is selected from glycerol, sorbitol, xylitol, propylene glycol and mixtures thereof. Composition by1. Композиция по уходу за полостью рта для применения в лечении повышенной чувствительности дентина, которая представляет собой жидкость при комнатной температуре или ниже и которая образует двухфазную непрозрачную
