ECC is a chronic, transmissible, infectious disease with a complex and multifactorial etiology. Factors attributed to the etiology of ECC include: excessive bottle feeding with sugar contained liquids; breast feeding on demand and/ or falling asleep while feeding; and nursing beyond recommended age for weaning. Other factors associated with ECC include genetic predisposition, parental education, nutritional, environmental, socio-economic, and parental style factors. This study was conducted to determine the association between ECC and oral hygiene, microbiological, BMI, dietary preference and genetic sensitivity levels to the bitter taste of 6-n-propylthiouracil.