Up to a quarter of three-year-olds in parts of West London have obvious tooth decay.
A shocking 25.3 per cent of three-year-olds in Hillingdon have had at least one tooth removed, a filling or tooth affected by decay. That is more than double the England average of 11.7%, according to a survey done by Public Health England. It is also the worst record in London.
In Brent the figure was one in five three-year-olds with obvious tooth decay, while in Harrow it was 18.3%. In London as a whole it was 13.6%.
The proportion of children with unhealthy teeth in Hillingdon is so high that it means that the average three-year-old in the city has nearly one whole tooth (0.91 teeth) affected by decay.
The England average is 0.36 teeth with decay per child.
Among three-year-olds with tooth decay in Harrow and Brent that rises to an alarming average of more than four teeth affected by decay per child.
This is the first time a survey on dental health has been done on children as young as three across England.
The data for North West England was collected in 2011, but this is the first time it has been published. The survey was done on children who attend nurseries. If parents did not want their children to be examined they could withdraw them from taking part in the survey.
