We assessed the proportion and characteristics of patients who do not regularly visit general health care providers but do visit dentists and whose unaddressed systemic health conditions could therefore be identified by their dentist. Of the 26.0% of children and 24.1% of adults that did not access general outpatient health care in 2008, 34.7% and 23.1%, respectively, visited a dentist. They varied by census region, family income, and sociodemographics. Dental practices can serve as alternate sites of opportunity to identify health concerns among diverse groups of US patients.