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The percentage of teeth previously decayed or currently decayed that were treated by filling, i.e. an index of the extent to which dental decay has been successfully treated by restorative techniques.

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 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.