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Tooth decay is the destruction of your tooth enamel, the hard, outer layer of your teeth. It can be a problem for children, teens and adults. Plaque, a sticky film of bacteria, constantly forms on your teeth.
The Causes Of Tooth Decay In Children. Tooth decay in children arises from the same major cause as in adults â bits of food that stick to teeth turn into acid due to the action of bacteria in the mouth and over time, this causes the tooth surface to corrode, leading to cavities.