Background. At present, the priority direction of medical science and practice is the prevention of dental diseases, especially in patients with somatic pathology. Patients with dyscirculatory encephalopathy develop a complex of neurological disorders, accompanied by impaired motor functions of hands, lips and chewing muscles, which leads to ineffective cleansing of the oral cavity from food residues and formation of soft and mineralized dental deposits on the dental surface. Therefore, these patients should use additional personal hygiene products.Objective. To evaluate the efficacy of hygienic care in patients with dyscirculatory encephalopathy using mouthwash with synbiotic complex.Methods. An observational clinical study was conducted on the basis of Neurology Unit No. 2 of Research Center of Neurology, Department of Cariology and Endodontics and Department of Biological Chemistry, A.I. Yevdokimov Moscow State Medical and Dental University. The study enrolled 82 patients aged from 45 to 74 years with cerebrovascular disease, dyscirculatory encephalopathy, decompensation (I68.7, according to ICD-10). Patients were divided into two study groups: group 1 (n = 44) — patients who used mouthwash with synbiotic complex; group 2 (n = 38) — patients who did not use mouthwash. The efficacy of mouthwash with synbiotic complex was assessed by using an index score of a simplified Greene Vermillion Oral Hygiene Index (OHI-S), Russell Periodontal Index (PI), Papillary Bleeding Index (PBI), and physicochemical parameters of the oral fluid. Statistical processing of the results was carried out using Stat Plus 7 (Analyst Soft Inc., USA).Results. The comparative analysis proved the efficacy of mouthwash with synbiotic complex. The hygienic status improved to (1.50 ± 0.12) points, the state of periodontal tissues — to (PI = (1.94 ± 1.45) points; PBI = (1.12 ± 0.11) points). The hydrogen index (pH) of the oral fluid decreased to weakly alkaline values — (7.92 ± 0.22) points; the activity of alkaline phosphatase decreased by a factor of 1.4, lactate dehydrogenase — by half, aminotransferases — by a factor of 1.3, and D-dimer — by a factor of 1.2.Conclusion. The obtained results demonstrate the efficacy of mouthwash as an additional means for personal hygiene. Mouthwash with synbiotic complex should be included in the daily oral hygiene care for patients with dyscirculatory encephalopathy.