The aim of the this study was to present data on oral care habits and knowledge of oral health in 2013, and to compare these data with results from a series of four previous cross-sectional epidemiological studies. All these studies were carried out in the city ofionkoping, Sweden, in 1973,1983,1993, 2003, and 2o13.The 1973 study constituted a random sample of L000 individuals evenly distributed in the age groups 3, 5,10,15, 20, 30,40, 50, 6o, and 7o yea rs.The same age groups with addition of a group of 8o-year-olds were included in the 1983,1993, 2003, and 2013 studies, which comprised 1,104;1,078; 987; and 1,010 individuals, respectively. A questionnaire about dental care habits and knowledge of oral health was used. The questionnaire contained the same questions in all the five studies, although some had to be slightly modernised during the 40-year period. During the period 1973-2013, a continous increase of individuals in the age group 20-6o years were treated by the Public Dental Service amounting to about 5o%. Almost 7o% of the 70- and 80-year-olds were treated by private practitioners. In 2013,10-20% of the individuals in the age groups 30-40 years did not regularly visit neither Public Dental Service nor a private practitioner.The corresponding figures for the individuals 50-80 years old were 4-7%. Similar number of avoidance was reported in the previous studies. In the survey 2013, about 20-30% of the individuals in the age groups 20-50 felt frightened, sick, or ill at ease at the prospect of an appointment with the dentist.These findings were in agreement with the results from the surveys 1973-2003. Among the younger age groups, 10-15 years, a reduction in self-reported "ill at ease" was found in the surveys 2003 and 2013 compared to the previous surveys in this series. In 2013, the knowledge of the etiology of caries was known by about 6o% of the individuals which was similar to that reported 1973 zoo3.Twenty per cent of the individuals stated that they did not know which etiological factors that causes caries.This percentage was equivalent during the period 1973-2013. About 85% of the individuals in all age groups brushed their teeth with fluoride tooth paste at least two times a day.These frequencies have gradually increased during the 40-year period. Around 40% in the age groups 50-8o years used toothpicks regularly in 2013.This is a about 1/3-1/2 less compared to 2003. In the age groups 20-40 years 3-14% used toothpicks for proximal cleaning in 2013. In 2013, about 35% of the individuals never consumed soft drinks, in comparison with 20% in 2003. In the age groups 3-20 years about 20% were consuming soft drinks every day or several times a week, which is a reduction by half compared to 2013