Can cavities spread by kissing?

My dentist explained that Streptococcus mutans, the primary bacterium responsible for tooth decay, is actually transmissible through saliva sharing. So yes, kissing can transfer these bacteria to your partner. However, they will only develop cavities if their own oral hygiene is lacking, though a professional checkup is always advised.

Think of it this way: you are exchanging saliva, which contains mouth bacteria, so technically yes, the bacteria can spread. But don't panic, it doesn't mean your partner will instantly get a cavity. Just make sure both of you keep up with brushing, flossing, and regular dental cleanings.

I was a bit embarrassed to ask about this, but I'm glad I found this post. Does this mean even sharing food or drinks can pass the decay bacteria to family members? I should probably visit a dentist soon to get my minor cavity checked just to be safe.

I didn't think much about sharing spoons or kissing my partner when I had untreated decay, but eventually, both of us ended up with dental issues around the same time. Please don't ignore active cavities like I did. Get them filled by a dentist as soon as possible.