1. mouthwashes containing dissolved chitosan or a pharmaceutically acceptable acid addition salt and dissolved fluoride ions, for use against erosive tooth demineralisation and further comprising olovo.2 dissolved. Mouthrinse according to Claim. 1, where the use is the prevention of erosive tooth demineralisation or dental treatment, the erosive demineralization zubov.3 affected. Tool according to claim mouthwash. 1, wherein the chitosan comprises unmodified hitozan.4. Means for rinsing the mouth according to Claim. 1, comprising from 200 to 2000 ppm, preferably from 250 to 1000 ppm dissolved fluoride ions, from 0.05 to 5% of the dissolved chitosan or a pharmaceutically acceptable acid addition salt, from 150 to 1000 ppm dissolved tin, 5 to 20% glycerin and from 0.3 to 5% gluconate, all% are based on the means for rinsing rta.5. A kit comprising: a) means for mouthwash containing dissolved chitosan or a pharmaceutically acceptable acid addition salt and dissolved fluoride ions, and further comprising a dissolved tin ib1) a container containing means for mouthwash and carrier readable indications for describing that means a mouthwash intended for application against erosive tooth demineralisation, or B2) a package comprising a container, a container comprising a mouthrinse, and packaging, carrier readable indications for describing that means a mouthwash intended for application against erosive tooth demineralisation, ilib3) a package comprising a container and the liner, container, soda zhaschy sredst1. Средство для полоскания рта, содержащее растворенный хитозан или его фармацевтически приемлемую кислотно-аддитивную соль и растворенные фторид-ионы, для применения против эрозивной деминерализации зубов, и дополнительно содержащее растворенное олово.2. Средство для полоскания рта по п. 1, где применение является профилактикой эрозивной деминерализации зубов или лечением зубов, пораженных эрозивной деминерализацией зубов.3. Средство полоскания рта по п. 1, где хитозан
