Objective To investigate geographic inequalities in the provision of NHS orthodontic care in England at the area level.Methods NHS dental activity data were analysed for the three financial years April 2016 to March 2019. The measures used were units of dental activity (UDA), units of orthodontic activity (UOA) and commencement of orthodontic treatment. Two orthodontic activity indices were created to assess relative volumes of care. Deprivation was measured using the index of multiple deprivations. Slope and relative inequality indices were used to assess inequality.Results Nearly 12.4 million UOA and 572,987 courses of treatment in England were reported under NHS arrangements in the three years studied. There were significant variations in the rates of UOA (0-716) and UDA (148-918) provided per 100 children (0-17 years) at the local authority level. The variation was not associated with deprivation at the local authority level.Conclusions There were significant disparities in the provision of NHS orthodontic treatment at the local authority level, but this was not associated with area-level measures of deprivation. Inequality in the uptake of orthodontic care may not be due to area-level disparities in service provision.
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