C Common belief in society that children teeth does not need regular check up and the high probability rate for ear1y Streptococcus mutant infection from mother to child, are suspected as the cause of the high rate of caries infection at children. In this research, the relation between the high rate caries at children in pre-school age (4-5 years) with the mother. Twenty pair mother and children are selected randomly from the population of children that attend the Jamiat Kheir Pre-school Joglo, West Jakarta. The high rate infection at the mothers were measured by DMF-T index, and the high rate caries at the children were using deft-t index. The research data show a positive correlation (r = 0.21) between caries at the mother and the caries at the children.