Decay, caused when the sugar in food and drink reacts with bacteria in plaque, attacks the areas between or on top of teeth.
BBC: NEWS | Health | Bad teeth blamed on fizzy drinks
"As soon as the tooth erupts, bacteria start developing plaque, " Nowak says.
CNN: Baby's teeth: What you should know
The conference also heard that good bacteria growing in dental plaque could help fight off bugs that cause gum disease and tooth decay if they are given a competitive edge.
BBC: Dental bacteria swap resistance
Under normal circumstances, the plaque that grows on teeth contains a mix of good and harmful bacteria.
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