05/27/2026
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Many parents are surprised to learn that babies are not born with the primary bacteria linked to cavities. One of the main bacteria associated with tooth decay, Streptococcus mutans, is commonly transferred from caregivers through saliva during daily activities such as sharing utensils, tasting food, blowing on hot meals, or kissing on the lips.
Once these bacteria establish themselves in a child’s mouth, the likelihood of early childhood cavities can increase significantly. This means a caregiver’s oral health plays an important role in shaping a child’s long-term dental health beyond genetics alone.
Dentists often encourage caregivers to maintain strong oral hygiene habits and reduce saliva-sharing behaviors during early childhood. Small daily choices can help lower bacterial exposure and support healthier teeth as children grow.
Credit: Pediatric dental and oral health research findings