Health care comprises the prevention, treatment, and management of illness and the preservation of mental and physical well-being through services offered by health professionals. Effective health care is an important aspect of promoting good health. This section presents information on selected determinants of health care utilization for children (having health insurance coverage and having a usual source of health care) and selected measures of health care utilization (immunization, children having a dental visit, and children with untreated dental caries [i.e., cavities]).