Background To identify barriers to participation in a primary oral health care programme aimed at preventing early childhood caries, as perceived by nurses. Methods Of a total of 140 randomly selected nurses employed in 40 government health centres in Lima, 123 completed a pre-tested questionnaire. Background variables were districts’ ‘socio-economic status’ (SES) and ‘years of experience’. Factor analysis was performed. ANOVA was applied for testing the influence of the background variables on the barrier factors. Chi-square test was applied to test for differences between single item barriers and the background variables. The Likert-scale (1–4) was used. Results There was no statistical significant effect of ‘SES’ or of ‘years of experience’ of nurses on any of the 7 barrier factors, nor on the 11 single item barrier factors. The highest mean score (3.81) was obtain...