Lee H - The researcher focused on the impact of adverse childhood experiences including social, psychological, and behavioral, on total tooth loss over the life course, with an evaluation of the sensitive period, accumulation, and social mobility models from life course research. Childhood information was extracted from 6,427 subjects aged > 50 by using data from the 2012 Health and Retirement Study (HRS) merged with multiple HRS data sources. Based on the findings, it was concluded that adverse experiences such as childhood trauma, abuse, and low educational attainment may give rise to failing oral health in older adults, particularly total tooth loss. It was also interpreted in this study that accumulation of adversity rather than changes in social and economic position over the life course may have a greater impact on oral health in later life.