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The mean number of teeth which are either actively decayed and require treatment or which have been treated for decay by filling or extraction only in those children who have some experience of dental decay, i.e. the total dental decay experience (current and past) in children who have had some dental...

The percentage of children in the whole age-group with any decayed/missing/filled teeth i.e. the proportion of children with a dmft/DMFT score greater than zero, and therefore some experience of dental decay.

The mean number of actively decayed teeth only in those children who have active decay, i.e. the mean number of teeth requiring treatment for decay in those children who currently require treatment.