Abstract Body (Do not enter title and authors here): Introduction: Cardiovascular disease remains a considerable source of years of life lost. Thus, identification of possible risk factors and prevention strategies continues to be important. In adults, oral diseases are associated with the risk of cardiovascular disease, including ischemic heart disease (IHD), myocardial infarction (MI) and ischemic stroke (IS). Few studies have examined the effect of oral health in childhood on the risk of cardiovascular disease in adulthood, thus overlooking a potentially important avenue of early detection of high-risk individuals.

Hypothesis: We hypothesize that poor childhood oral health is associated with IHD, MI, and IS in adulthood.

Methods: Using nationwide Danish registry data from the National Child Odontology Register, National Patient Register, and the Central Person Register we followed individuals born between 1963 and 1972. Follow-up started in 1995 or by age 30 (whichever occurred last), and ended in 2018, where study participants were aged 46 to 56. Using Cox-proportional hazards modelling we examined the association of childhood oral health, defined as the highest registered level of dental caries and gingivitis for any one individual, with the occurrence of IHD, MI, and IS in adulthood. The highest achieved level of education between ages 25 and 30 was used as Cox-strata.

Results: The study consisted of n = 569.057 individuals, 51.2% male, 48.8% female. The incidence of IHD was 26% (1.17; 1.86) higher in females with high levels of caries in childhood compared to those with low-level caries, 19% (1.08; 1.40) higher in males. Severe caries in childhood was associated with a 58% (1.19; 2.09) higher incidence of MI in females, 19% (1.01;1.42) higher in males, and a 45% (1.19; 1.78) higher incidence of IS, 52% (1.27; 1.81) in males. Females had a 52% (1.19; 1.94) higher incidence of MI, and males a 32% (1.15; 1.52) higher incidence of IS, if they had high levels of gingivitis as children (table 1).

Conclusion: Poor oral health in childhood is associated with an increased incidence of IHD, MI, and IS, pointing to a potential new avenue for early identification of and prevention amongst high-risk individuals.