It's not uncommon to see a parent pick up a pacifier that's dropped on the ground and try to clean it by popping it into his or her mouth and then into baby's. Not a good idea. If the parent has gum disease, this person can transfer the bacteria in saliva to the baby. We've seen children as young as four years old with gum disease – likely picked up from their parents.
For this reason, it's also a good idea to avoid sharing anything that can pass saliva from one person to another. This includes toothbrushes, cups, utensils, lipstick, even musical instruments. As well, around their first birthday, start bringing your children to the dentist for regular checkups of the health of their gums and teeth.