All 55-yr-old citizens (n = 1012) of Oulu (a middle-sized Finnish town
) were invited to a clinical examination; 780 agreed to participate. T
he associations of lifestyle with decayed tooth surfaces and the numbe
r of teeth were studied in the 533 dentate subjects. Meaures of lifest
yle included dietary habits, a smoking habit, alcohol consumption and
physical activity. When the associations of dental caries with lifesty
le, sex, dental, health behavior, social class and number of teeth wer
e studied by logistic regression analysis, lifestyle was shown to have
an independent association with dental caries. Further analysis of th
e data showed that dental caries increased with a more negative lifest
yle in every social class, but most significantly in the lowest. Numbe
r of teeth was not associated with lifestyle, but subjects with lower
social statust had fewer teeth than those with higher social status. T
he association of lifestyle with dental caries supports the idea that
behavior in a broader sense should be taken into consideration in cari
es prevention.