AIMS: To investigate the relationship between caries risk and glucosy-lated haemoglobin and to evaluate the use of a computerized caries risk assessment program as a predictor of metabolic control in school-children with Type 1 diabetes mellitus. METHODS: The material con-sisted of 64 young Type 1 diabetes mellitus patients (8-16 years) at-tending an outpatient paediatric clinic. Within 2 weeks after the onset of diabetes, a caries risk assessment was carried out with the aid of a computer-based program (Cariogram) and data on the level of meta-bolic control were collected from the medical records at the 3-year check-up. Caries increment was registered at recall clinical examina-tions. RESULTS: A statistically significant positive relationship be-tween caries risk and metabolic control was found (r = 0.51; P < 0.01), with a sevenfold increased risk of impaired metabolic control after 3 years in those assessed with high caries risk at onset (OR 7.3; P < 0.01). When the Cariogram was used as a predictor for the metabolic state of the disease, the sensitivity and specificity was 75% and 71%, respectively. The negative predictive value was 91%. CONCLU-SIONS: Our data suggested that a caries risk assessment at the diagno-sis of diabetes mellitus in children may be a good indicator of overall health care that can provide useful prognostic information on the level of metabolic control after 3 years.