The Child Dental Health Survey 2005-06 provides information on the oral health of children attending school dental services in Australia, and shows that decay is relatively common in Australian children. Nearly half children aged 5-6 years (48.7%) had a history of dental decay in the deciduous teeth (also known as baby teeth). Likewise, nearly half of children aged 12 years (45.1%) had a history of decay in the permanent teeth. Young children from the lowest socioeconomic areas had about 70% more dental decay than children from the highest socioeconomic areas.