We don’t think of tooth decay as being a disease or illness like, say, Chickenpox but they are considered to be contagious. Streptococcus Mutans is a strain of bacteria involved in the process of tooth decay. Researchers believe that this bacteria can be passed from you to your baby through saliva by sharing spoons, testing foods before feeding them to your baby, and cleaning off a pacifier in your mouth instead of with water. These germs can start the process that causes cavities even before your baby’s primary teeth emerge, so it’s important to avoid sharing saliva with your baby from the start.
In addition, if a baby tooth has an untreated cavity or infection, it is able to spread to the adjacent teeth and cause unnecessary damage.