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Dental erosion involves demineralisation where teeth are attacked by acids and tooth enamel is consequently worn away.
BBC: Tea 'good for teeth'
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More than half of those aged between four and 18 also suffered from dental erosion - when acid found for example in fizzy drinks and some fruit juices directly rots the teeth.
BBC: Dentist
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But despite the incidence of tooth decay and erosion, the majority of youngsters do seem to be aware of the importance of dental hygiene - two thirds of them brush their teeth twice a day.
BBC: Dentist