England and Wales, 7% of 15-year-olds had four teeth extracted, 6% had two teeth extracted and 2-3% had one tooth extracted.In our previous paper, 1 we did note the problems with analysing trends due to changing methodologies in the surveys but that for 12-and 15-year-olds, the impact was likely to be minimal. It does therefore appear that the proportion of 15-year-olds who have had extractions for orthodontic treatment has decreased over the last ten years, despite a relatively constant number of 12-year-olds undergoing orthodontic treatment at the time of the survey (8-9%) and an increase in the number of 15-year-olds under treatment from 14% to 18%.