Objectives: This study aimed to confirm the correlation between BMI and the prevalence of periodontal disease in adults, using data from the National Health and Nutrition Survey. Methods: The data included general characteristics and oral examination results of individuals surveyed in the 7th National Health and Nutrition Survey (2016-2018). Among the variables examined, age, gender, education, income, obesity, hypertension, diabetes, high cholesterol, smoking/drinking, oral examination, and brushing habits were considered as the general characteristics of the study participants. Individuals with more than 4 mm depth of the periodontal pocket were defined as having periodontal disease. BMI was classified into underweight (BMI<18.5 kg/m2) and normal (18.5 kg/m2