Is early childhood caries caused by a disrupted oral ecosystem?

Early childhood caries (ECC) is a common dental condition in young children. While it is often described as a disease caused by sugar and acid-producing bacteria, newer research suggests it is the result of a much longer biological process. This process involves the development of the mouth's environment from before birth through the first few years of life.

What the research says

Research suggests that ECC is the clinical result of a disrupted developmental ecology of the infant oral ecosystem. This means that the health of a child's mouth is shaped by a complex interaction between the host (the child), microbes, and the environment ². These interactions begin in the prenatal period and continue through the first 1,000 days of life. Factors such as maternal health, nutrition, and immune system development influence how these oral ecosystems form ².

Studies also show that the oral environment is not uniform. In healthy children, the bacteria on teeth follow specific patterns, such as a gradient from the front to the back of the mouth ⁶. In children with ECC, these patterns are disrupted because the disease causes a reorganization of the bacteria ⁶. Additionally, physical defects in the tooth enamel—which can be caused by environmental factors before or after birth—can make teeth more vulnerable to decay because the enamel is thinner and harder for bacteria to resist ⁷.

What to ask your doctor

• How does the development of my child's oral microbiome affect their risk for early childhood caries?
• Are there specific signs of enamel defects that could make my child's teeth more susceptible to decay?
• What role do early factors, like nutrition and maternal health, play in my child's long-term oral health?
• What are the most effective ways to maintain a healthy oral ecosystem for my child?