Children's access to Medicaid dental services is a long-standing concern. The tragic case of a 12-year-old boy who died from an untreated infected tooth that led to a fatal brain infection renewed attention to this issue. He was enrolled in Medicaid-a joint federal and state program that provides health care coverage, including dental care, for 30 million low-income children-but, like many children in Medicaid, he experienced difficulty finding a dentist who would treat him. At the federal level, the Centers for Medicare & Medicaid Services (CMS), an agency within the Department of Health and Human Services (HHS), oversees Medicaid. In this report, GAO examined (1) state strategies to monitor and improve access to dental care for children in Medicaid and (2) CMS actions since 2007 to improve oversight of Medicaid dental services for children. GAO surveyed all state Medicaid programs and interviewed state and federal officials, and dental researchers and associations.