30/07/2026
A baby isn't born with the bacteria that cause most cavities. Those bacteria are usually acquired from another person's saliva.
As a baby's first teeth begin to erupt, everyday saliva-sharing habits—such as kissing on the lips, sharing spoons, tasting food before feeding, or cleaning a pacifier with the mouth—can transfer cavity-causing bacteria.
One of the primary bacteria involved is Streptococcus mutans. Once it reaches newly erupted teeth, it attaches to the enamel, feeds on sugars from food and drinks, and produces acids that gradually dissolve the tooth surface. Over time, this can lead to Early Childhood Caries (ECC)—one of the most common chronic diseases affecting children worldwide.
This doesn't mean parents and caregivers should stop showing affection. Kissing on the forehead or cheek, cuddling, hugging, and other loving interactions are generally considered safe. The goal is simply to reduce unnecessary saliva sharing during infancy and keep caregivers' mouths healthy, since good oral health in parents and caregivers can help support good oral health in children.
Small preventive habits during the first years of life can make a lifelong difference to a child's smile.
• Disclaimer: This post is for educational purposes only and is not a substitute for professional dental advice.