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these periods of particularly active caries it would be necessary
to inspect the five, nine and 13-year-old groups twice yearly.
The following graph shows that in the six, seven, eight and
nine-year-old groups of boys the percentage of healthy dentitions
is greater than -in the case of girls. This is due possibly to the
fact that girls' teeth usually erupt earlier than boys', and they
have therefore at those ages more teeth liable to decay. The same
thing is noticed in the 12-year-old group of boys. Girls have, as
a rule, all their 12-year-o 1 d-mo 1 ars through at this age, whereas
the boys' second molars are usually at the stage of eruption. The
14-year-old Leavers' group shows that the boys have a slightly
better percentage of healthy dentitions compared with the girls.