Backgroud: Oral health problems can occur easily. The most common and one of the biggest burden diseases is dental caries. Caries occurred in children aged five with a very high index. Children are susceptible to oral health problems, including dental caries and also a low levels of oral hygiene. Preschool children are one of the age groups with a high risk of experiencing caries. They tend to consume sweet drinks and beverages. The higher consumption of this sugar can have a greater impact on the condition of children's tooth decay.

Aim: This study aims to explore the correlation between a high-sugar diet and oral health outcomes in preschool children.

Materials and Methods: This study was an analytic observational which was conducted in 2023. The population of this study was parents and the preschool children who were admitted to the playgroup and kindergarten in South region of Surabaya. The total of the participants was 252.

Results: There is a correlation between a high-sugar diet with dental caries and oral hygiene significantly (p-value < 0.05). Children who eat more high-sugar foods or drinks will susceptible to a higher number of caries and causes more plaque to adhere to the teeth surface.