<p>The exploration of public beliefs and knowledge about dementia and its prevention allows us to visualize the misconceptions about brain and cognitive health, the knowledge of risk factors for dementia and the actions implemented by the general population to prevent cognitive decline. In this topic, some factors play an important role, for example, diet, cholesterol level, hypertension, obesity, sleep, physical and cognitive inactivity. The determination of protective or risk factors, as well as the establishment of a baseline of public knowledge, allows the design of interventions aimed at enhancing knowledge about dementia prevention.</p>