The investigators will propose a 4-year randomized controlled trial of family-centered oral health promotion for new parents which aims to increase the proportion of parents brushing their infants' teeth at 1 year, establishing proper feeding and dietary habits, reducing the transfer of MS from the parents to their infants and then reducing the risk of ECC of the children at 3 years. The investigators also aim to improve the oral hygiene status of the new parents and prevention of oral diseases among themselves.