Background: To estimate the prevalence of caries and to study oral health habits (oral hygiene, toothbrushing fre-quency, cariogenic or no cariogenic diet, visits to dentist) in children aged 6 to 12 with social exclusion risk.Material and Methods: A cross sectional study was conducted in a sample of 160 children aged form 6 to 12 years belonging to Colegio Madre Petra in Torrent and Colegio Nuestra Señora de los Desamparados in Nazaret (Valen-cia). Among other variables DMFT and Greene and Vermilion simplified plaque index were analyzed. Results: The prevalence of caries observed was 81.87% and the global DMFT was 4.481. The mean plaque in-dex observed was 1.12. No statistically significant differences were found between global DMFT and sex, global DMFT and age, global DMFT and diet, global DMFT and visits to the dentist and global DMFT and plaque index. A significant association was seen between global DMFT and ethnicity and global DMFT and brushing frequency. Statistically significant association was found also between plaque index and visits to the dentist and plaque index and diet. Conclusions: It was observed that children at risk of social exclusion had a very high global DMFT and a regular plaque index. So, it can be concluded that social exclusion constitute an underlying factor that increase caries pre-valence and global DMFT and a marker of poor oral hygiene habits.