A quarter of children have dental decay by the time they start school.
This occurs when bacteria in the mouth break down sugar to produce acid, which attacks and dissolves the teeth.
Avoiding sugary food and drinks and brushing regularly with an age-appropriate fluoridated toothpaste remain the best ways to ensure children have healthy teeth.
But despite parents’ best efforts, some children’s teeth are inherently weak and decay more easily.
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Historically this was thought only to affect a very small minority (0.1%) of people who had rare genetic conditions such as amelogenesis imperfecta (enamel malformation).