The figures showed that children in north-west England were most likely to have experienced decay of the dentin layer.
Nearly one-in-three youngsters aged five in England has tooth decay, figures show.
Data from the National Dental Epidemiology Programme for 2021 to 2022 shows that 29.3% of children aged five have enamel decay or more serious decay to the layer of dentin under the enamel.
Regionally, this figure ranged from 23.3% in the South West to 38.7% in the North West.
Of the one in three children with any decay, 23.7% had the more serious dentinal decay.
This was similar to the finding of the previous 2019 survey when 23.4% had dentinal decay.