Research objective: The aim of this research was to determine whether age and education are a risk factor for development of mild cognitive impairment in people with treated periodontitis. Materials and methods: 30 participants, 18 female and 12 male, aged 29 to 71, were included in this research. Informed consent was requested from all participants and anamnestic data as well as oral hygiene habits were recorded. A detailed periodontal status was determined. All of the participants underwent neuropsychological treatment. Results: The most prevalent stage of periodontitis among the participants was stage III. Out of 30 participants, as many as 19 reported a family history of periodontitis. Participants' oral hygiene habits were satisfactory, as evidenced by low plaque index and bleeding on probing index. Questionnaire analysis confirmed that the participants were well-educated and adequately maintained their oral hygiene, regularly visiting dental professionals. In fact, 27 participants reported using interdental brushes. The median age of the participants was 45,00 (IQR 40,30-47,00), and the median years of education were 12,00 (IQR 12,00-15,00). Among the assessed cognitive functions, mental flexibility and psychomotor speed were examined using the Symbol Digit Modalities Test (median=35,00; IQR=28,3-37,8). The results showed that the participants performed significantly worse compared to reference values in a healthy population. Linear regression analysis demonstrated that the presence of residual periodontal pockets was not a risk factor for the development of mild cognitive impairment (MCI), while age and level of education proved to be statistically significant predictors of MCI in individuals with treated periodontitis. Conclusion: Older age and lower level of eduaction proved to be risk factors for mild cognitive impairment in people with treated periodontitis.