[Oral health behavior and parental cognition of first-grade children in urban and suburban areas of Shanghai].

Purpose: To investigate oral health behaviors of first-grade school children and parents' cognition of oral health in urban and suburban areas of Shanghai, and to analyze and compare the differences between the two areas, so as to provide reference for formulating oral health intervention measures and oral health education.

Methods: A total of 3 312 first-grade school-aged children in Shanghai were included by cluster random sampling method. Relevant data were collected through questionnaire survey of parents' oral health and clinical oral examination of children.

Microbiota of preterm infant develops over time along with the first teeth eruption.

Objective: The temporal growth of the infant microbiome in the early years of life influences short- and long-term infant health. The aim of this longitudinal study was to investigate bacterial dynamics in the microbiome of preterm infants during tooth eruption.

Methods: Saliva samples from normally delivered ( = 24) and preterm infants ( = 31) were collected 30 days after birth and after the eruption of two primary mandibular incisors.