Breastfeeding and early tooth eruption as predictors of dental caries occurrence throughout childhood.

The relationship between prolonged breastfeeding and early childhood caries remains controversial. The present study investigated relationships between dental caries experience at 42 months of age and related risk factors, focusing on breastfeeding and the number of erupted teeth. Data from 6746 children aged 42 months were analyzed. Anthropometric measurements and oral examinations were performed, and an interview sheet was provided directly to the guardians. Logistic regression analysis was performed to clarify the risk factors related to dental caries occurrence at 42 months of age. Of the 5161 children included, 13.3% had experienced dental caries between 18 and 42 months of age. Logistic regression analysis results indicated a significant association with dental caries occurrence by 42 months of age for the following factors: 12 or fewer erupted teeth (P < 0.05), 17 or more erupted teeth (P < 0.05), breast feeding (P < 0.001), and breast and bottle feeding (P < 0.01) at 18 months of age. These results suggest that breastfeeding and the number of erupted teeth at 18 months of age are important factors for dental caries experience at 42 months of age. Dental visits and guidance on breastfeeding, diet, and oral hygiene beginning when primary teeth start to erupt may benefit oral health throughout childhood.