It may come as a surprise, but cavities are contagious. That’s right—just like catching a cold, you can also “catch” a cavity.
While sugar often gets the blame for tooth decay, it’s actually bacteria that wear away enamel and cause cavities. These bacteria can be passed from one person to another. Studies have shown that mothers can transfer cavity-causing bacteria to their children—and even to their spouses.
Research on couples has found that kissing can spread these bacteria. If one partner has poor oral hygiene, the other may develop cavities, even if they’ve never had one before. Gum disease bacteria can be shared in the same way.
So, the next time you taste your child’s food or lean in for a kiss, remember—bacteria may be tagging along. The good news is that reducing your risk is simple: brush and floss daily, chew sugar-free gum, and keep up with regular dental visits.
