Subject. Physicochemical properties of mouthwashes developed and produced by Svoboda Company for everyday use and oral hygiene maintenance. Objectives. To study dynamics of qualitative and quantitative physicochemical and organoleptic properties of mixed saliva in young people subjected to using hygiene and prophylactic domestic mouthwashes. Methodology. The study was carried out by Department of Therapeutic Dentistry and Propaedeutics of Dental Disease, by Department of General Chemistry of Ural State Medical University and by Department of Control Systems Modeling of Ural Federal University. The study involved 40 patients from dental student volunteers (male - 15, female - 25), the average age of volunteers was 18.50 ± 1.6 years. The patients were divided into two groups each containing 20 persons. Mouthwash 1 was a common hygiene oral rinse. Mouthwash 2 was a treatment and prophylactic oral rinse, all participants used the mouthwashes during 3 weeks. Results. The use of the reported mouthwashes contributes to increase in cleansing properties of saliva in both groups of subjects. During mouth rinse treatment, the surface tension of saliva increases. The surface tension of mixed saliva is increased by 28.9% (p ≤ 0.05) with Mouthwash 1 and by 9.5 % (p ≤ 0.05) with Mouthwash 2. The surface tension of mixed saliva of subjects of the second group becomes slightly above normal (40-60 erg/cm2; p ≤ 0.05). Conclusion. The study of changes in physicochemical properties of mixed saliva in young people, volunteers of the two groups, subjected to liquid oral hygiene products, mouthwashes, during three weeks showed the following results: the treatment and prophylactic oral rinse (Mouthwash 2 with titanium glycerosolvate aquacomplex and sodium hyaluronate) promotes more adequate maintenance of the acid-base balance in the oral cavity, pH change of mixed saliva toward the alkaline and maintenance of the normal level (p ≤ 0.05) of buffer capacity which reduces the risk of dental caries.