Figure 2

Caries development, depicted by mean values of ∆DMFS for each birth cohort as well as the total study group, for three exposure groups: reported tobacco users at baseline, i.e., 16 years of age (“baseline users”), the remaining users reported tobacco use at any subsequent occasion during the follow-up, i.e., 17–19 years of age (“users commencing later”) and “never users”, respectively.