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The purpose of this study was to describe oral hygiene factors in infants and toddlers living in Sweden with special reference to caries prevalence at 2 and 3 yr of age and to immigrant status. The study was designed as a prospective, longitudinal study starting with 671 children aged 1 yr. At 3 yr, all the children were invited to a further examination. A total of 298 children, randomly selected from the original group, were also examined at 2 yr. The accompanying parent was interviewed about the child's oral health habits. Children who were free of caries at 3 yr had had their teeth brushed more frequently at 1 and 2 yr of age, had used fluoride (F)-toothpaste more often at 2 yr of age, and had a lower prevalence of visible plaque at 1 and 2 yr of age than children with caries. Immigrant children had had their teeth brushed less frequently, had used less F-toothpaste, and had a higher prevalence of visible plaque at 1 yr of age than nonimmigrant children. Early establishment of good oral hygiene habits and regular use of F-toothpaste seem to be important for achieving good oral health in pre-schoolchildren.