Powdered milk containing Lactobacillus paracasei SD1 was chosen as the vehicle for the probiotic supplement because of its convenience to storage and use, long shelf life, health benefits and low cariogenic potential. In addition Lactobacillus paracasei SD1 is a normal flora that isolated form caries-free children, Thus, this strain may be useful for a potentially probiotic microbial strain for oral cavity.