Introduction and Objetive: Periodontal disease is a pathology of bacterial origin with inmunoinflamatory manifestations giving rise to loss of insertion and tooth-support. Recently a relation has been reported between periodontal disease and other systemic diseases. According to the last National Study of Oral Health in Colombia (ENSAB III 1998), knowledge and awareness of periodontal disease and practices is more deficient than for other pathologies. The aim of this investigation was to evaluate the knowledge on periodontal disease of a specific population, analyzing the impact of an educational and motivational talk. Materials and Methods: A descriptive study of longitudinal communitarian intervention was carried out in a sample of 301 patients in different companies from the Metropolitan Area of Medellin; an initial survey was completed, followed by an educational and motivational talk and a toothbrush and toothpaste were given to every participant. Afterwards, the initial survey was carried out to the same employees in order to evaluate the impact the intervention had and the level of acquired. Results: Knowledge increased 42,4% from 2,38 ± 0,78 to 3,39 ± 0,81. Conclusion: Significant changes in learning about periodontal disease was achieved.Keywords: Gingivitis, Periodontitis, Level of knowledge.