The number of patients with dementia admitted to hospitals is increasing. However, the care and treatment of these patients tends to be suboptimal. A response to this is a widespread implementation of educational initiatives. Nevertheless, the effect of such initiatives is questioned. The aim of this study was to investigate the impact of a dementia education intervention by examining the self-reported outcomes of general hospital staff and exploring the staff’s experiences of these outcomes. An explanatory sequential mixed-methods design framed the study method. The quantitative data collection included repeated questionnaires: pre-intervention (n = 849), one month post-intervention (n = 618), and five months post-intervention (n = 468) followed by a qualitative data collection using interviews (n = 16). The GRAMMS guideline was followed. The integration of the quantitative and qualitative results suggests that the impact of the education intervention can be ascribed to the interdisciplinary focus, which facilitated a comprehensive commitment to creating careful solutions for patients with dementia. A prioritization of person over task seems to be assisted by an improved interdisciplinary cooperation initiated by the inclusion of all employed staff at the hospital in a dementia education intervention.