A Happy Mouth is…a Happy Mind

### Learning Objectives Describe the relationship between oral health, mental wellbeing, and quality of life. Explain the bidirectional association between mental health disorders and oral health behaviours. Discuss the emerging evidence linking periodontitis with Alzheimer's disease and dementia, including inflammatory and microbial pathways. Apply evidence-based periodontal diagnostic principles in accordance with European Federation of Periodontology (EFP) guidelines, including the 2017 classification of periodontal diseases. Identify EFP-recommended periodontal treatment objectives, including biofilm control, inflammation reduction, disease stabilisation, and prevention of progression. Accurately stage and grade periodontitis to inform prognosis and treatment planning. Recognise the role of periodontal diagnosis, treatment, and maintenance in supporting long-term systemic and cognitive health.