At age 5, the children visited a dentist, and were examined for decayed, missing and filled primary tooth surfaces and severe early childhood caries, or severe cavities.
Severe early childhood caries were defined as six or more decayed, missing and filled primary tooth surfaces.
Among the children in the study, 23.9% had severe cavities and 48% had at least one tooth surface affected by a cavity.
Kids who were breastfed for two years or longer had a 2.4 times higher risk of having severe cavities, compared to kids who were breastfed for less than a year.
Karen Peres, lead author of the study and associate professor at the University of Adelaide in Australia.