The Department does hold data on the number of children seen by an National Health Service dentist before 31 December 2015 but not the data requested in the previous Question. The hon. Member asked how many children were seen by a NHS dentist in each 12 month period that his Department held data for. Data for children seen in a 12 month period is not available for earlier periods but between 31 March 2006 and 31 December 2015 data was collected on the number of children seeing an NHS dentist in a 24 month period. This data is set out in the attached table.
The change in the measurement period was to align with the National Institute for Health and Care Excellence guidance on the maximum recommended interval of routine check-ups for children. For adults the maximum recall period is 24 months so this remains the period used for adults.