A growth in research focusing on the oral health of older adults has been evident in recent years. However, there are new and complex challenges for geriatric dental researchers studying the increasingly functionally dependent and cognitively impaired older adult population. Many geriatric dental studies have under-reported oral disease prevalence and incidence by excluding adults who are cognitively impaired and/or behaviourally difficult. To ensure representative samples of older adult populations are studied, traditional oral epidemiological protocols in studies with cognitively impaired adults, require additional components detailing: (1) communication and behaviour management strategies for cognitively impaired adults; and (2) methodologies to facilitate the completion of dental examinations. A description of such additional protocol components is presented, along with a discussion of the use of cognitive testing tools by dental researchers.