Cavities aren’t contagious in the way a cold is—but the bacteria associated with tooth decay can transfer through saliva, especially in early childhood. Here’s what research supports, what most approaches miss, and how to reduce risk in families and couples.
Worried you can catch cavities from kissing? The bigger risk usually isn’t a partner—it’s the daily conditions that let decay take hold. Learn what science says about bacterial transfer, childhood colonization, and the signals that predict repeat cavities.