Belinda Borrelli

Background Tooth brushing is effective in preventing early childhood caries. However, it is unclear how children’s and caregiver’s tooth brushing are reciprocally related. Purpose The current study investigated whether the longitudinal relationships between children and caregiver tooth brushing are moderated by a caregiver-targeted child oral health intervention and caregiver depression. Methods Secondary analysis of a randomized clinical trial that tested whether caregiver-targeted oral health text messages (OHT) outperformed child wellness text messages (CWT) on pediatric dental caries and oral health behaviors (n = 754, mean child age = 2.9 years, 56.2% Black, 68.3% <poverty level). Tooth brushing behaviors were self-reported by caregivers using a timeline follow-back method at baseline and 4, 12, and 24 months later. Caregiver depressive symptoms were self-reported at baseline. A multigroup random intercept cross-lagged panel model examined relationships between caregiver and child tooth brushing for four post hoc groupings of condition: OHT versus CWT, and caregiver depressive symptoms: high versus low. Results Within-participants analyses revealed that caregiver tooth brushing at Months 4 and 12 positively predicted their child’s tooth brushing at Months 12 and 24 for caregivers in the OHT condition with low depressive symptoms (i.e., moderation by depressive symptoms and condition). Similarly, children’s tooth brushing at Month 4 positively predicted caregiver tooth brushing at Month 12 for caregivers in the OHT condition with low depressive symptoms. There were no significant associations among participants in the CWT condition, regardless of depressive symptoms. Conclusions Child and caregiver tooth brushing have reciprocal influences, but only for those in the OHT condition with low depressive symptoms.