Since periodontal disease is the main cause of dental loss in adults, and seeing that nutrition is one of the vital processes for organic hemostasis, it is of great importance the interdisciplinary knowledge for a better understanding of the disease, which may be influenced by diet. The main objective of this study was to collect information about patients attending the dental clinics of UFSC, to evaluate their diet, analyzing the nutrients ingested and eating and routine habits, and to search for an association between these habits and the chronic periodontal disease, classifying it according to their gravity. For that, the pre-existing odontological records of the research subjects were used, which were under treatment or had already been treated in dental clinics of UFSC. Thirty patients were evaluated clinically and radiographically, and all had a minimum age of 18 years. Sex restrictions were not applied. Data were tabulated and organized into Excel spreadsheets, and the statistical test Fisher's Exact was used to identify possible associations between routine feeding of these patients, oral hygiene habits, clinical and socioeconomic data, and periodontal disease. Only the association between age and dental mobility with severity degrees of periodontal disease resulted in statistical significance (p = 0.039 and p = 0.001, respectively). Patients older than 50 years and who had dental mobility appear to be more related to cases of severe grade chronic periodontitis.