Objectives: The aims of this study were to explore the shape of the relationship of income and education with periodontal health, and to assess the interactions between them and race/ethnicity. Method: Individual level data from the Brazilian National Oral Health Survey in 2010 (Pesquisa Nacional de Saúde Bucal—SB Brasil 2010) were obtained for 9,779 subjects. Relations between per capita income and education with periodontal health were smoothed using Locally Weighted Scatter-plot Smoother (Lowess) technique. Multivariable logistic regression was used to assess independent effects of income, education, race/ethnicity adjusted for age, sex and time since last dental appointment. Results: Prevalence of adults with moderate to severe and severe periodontitis was 17.6 and 6.5%, respectively. The relationship between periodontal health and income was curvilinear, showing a threshold of no relationship for income levels higher than US600/month.Inmultivariableanalysis,aftercontrollingforcovariates,onlyincomewassignificantlyassociatedwithperiodontalhealth.Therewasnosignificantinteractionofincomewithraceoreducation,neitherbetweenraceandeducation.Conclusion:Therelationbetweenperiodontalhealthandincomewascurvilinearandindicatedthepresenceofathreshold,supportingincometransferprograms.Beyondthethreshold,onlyeducationpresentedanegativelinearrelationshipwithmoderatetosevereperiodontitis.Objetivo:Osobjetivosdesteestudoforamexplorararelac\ca~oentrerendaeeducac\ca~ocomdoenc\caperiodontaleavaliarainterac\ca~oentreeleserac\ca/etnia.Meˊtodo:DadosindividuaisdoinqueˊritoepidemioloˊgicodesauˊdebucaldaPesquisaNacionaldeSauˊdeBucal(SBBrasil2010)foramobtidospara9.779indivıˊduos.Arelac\ca~oentrerendapercapitaeeducac\ca~ocomsauˊdeperiodontalfoisuavizadausandoteˊcnicadeLocallyWeightedScatterplotSmoother(LOWESS).Utilizou−seregressa~ologıˊsticamultivariaˊvelparaavaliarosefeitosindependentesdesexo,idade,renda,educac\ca~o,rac\ca/etnia,possedebens,uˊltimavisitaaodentistaenuˊmerodepessoaspordormitoˊrio.Resultados:Aprevale^nciadeadultoscomdoenc\caperiodontalmoderadaegravefoide17,6e6,5 1.050/mensais, a partir do qual não havia relação entre as variáveis. Na análise multivariavel, após ajuste por covariadas, apenas renda estava associada significativamente com saúde periodontal. Não foram encontradas interações significantes entre renda e educação ou raça/etnia, nem entre educação com raça/etnia. Conclusões: A relação entre saúde periodontal e renda foi curvilínea com a presença de efeito de limar, dando suporte para programas de transferência de renda. Além do limiar, apenas educação mostrou associação linear negativa com periodontite moderada a severa