Obstructive sleep apnoea (OSA) is a common and serious sleep disorder marked by repeated airway obstruction. It leads to fragmented sleep, intermittent hypoxia and significant systemic health risks. This chapter examines the complex interplay between OSA and oral health, highlighting the role of dental professionals in early detection, management and interdisciplinary care. Risk factors for OSA, such as obesity, craniofacial anatomy and lifestyle choices, contribute to OSA severity, with consequences ranging from cardiovascular disease and diabetes to cognitive impairment and mood disorders. Oral health implications of OSA include bruxism, dry mouth, periodontal disease and temporomandibular joint dysfunction, often exacerbated by prolonged continuous positive airway pressure machine (CPAP) use. Treatment strategies extend beyond CPAP therapy, including oral appliances, myofunctional therapy and surgical interventions tailored to patient needs. As frontline providers, dentists are crucial in identifying anatomical risk factors, recommending appropriate therapies and collaborating with sleep specialists to ensure comprehensive care. By integrating OSA screening into routine dental practice, early intervention can improve patient outcomes and reduce the long-term burden of untreated sleep apnoea. This chapter provides an evidence-based overview of the latest diagnostic tools, treatment modalities and collaborative approaches for managing OSA through an oral health lens.