Sociodemographic conditions, knowledge of dental diseases, dental care, and dietary habits.

Objectives: This study's aim was to present data on the sociodemographic conditions, knowledge of dental diseases, dental care, and dietary habits among children aged 3, 5, 10, and 15 years in Da Nang, Vietnam.

Methods: A cross-sectional epidemiological questionnaire study was conducted in a population of 840 children randomly selected by their year and month of birth (January to July), including 210 individuals in each age group. A self-reported questionnaire was completed by the parents of 3- and 5-year-olds, and a modified questionnaire was given to 10- and 15-year-olds to complete by themselves.

Results: Mass media constituted the main source of oral healthcare information. Parents assisted with tooth brushing in 86 percent of 3-year-olds and 71 percent of 5-year-olds. Fluoride toothpaste was used by 44-78 percent of children, with no clear age-related trend. Within the past year, 60 percent of 3- and 5-year-olds, 20 percent of 10-year-olds, and 49 percent of 15-year-olds reported they had not visited a dental professional. Sweets were consumed between principal meals by 70-80 percent of children. Milk with sugar was regularly consumed by 71 percent of 3-year-olds and 91 percent of 5-year-olds.

Conclusions: Children showed frequent sugar consumption and insufficient frequency of brushing their teeth with fluoride toothpaste. Food-based dietary guidelines should play a significant role in nutrition and oral health. It is especially important that oral health prevention programs reach preschool children before they establish unhealthy dietary habits. Parental education about oral health and access to oral healthcare services are also needed to improve children's oral health.