Nursing home residents over the age of 65 years are at high risk for poor oral health and related complications such as pneumonia and adverse diabetes outcomes. A preliminary study found that Massachusetts' nursing homes generally lack the training and resources needed to provide adequate oral health care to residents. In this study, an intervention targeting Certified Nurses' Aides (CNAs) was developed and tested. We hypothesized that following the training, CNAs would have increased knowledge and self-efficacy toward providing oral health care to the residents in their charge.