Can kissing cause cavities  ? 

As you're probably well aware, kissing of any kind will transmit some saliva between you and your partner. And that can be a bad thing if either of you have sub-par oral health. Why? Because the bacteria that can cause gum disease and cavities are contagious.

Cavities can be transmitted from one person to another. When evaluating kissing couples, studies have found that it is possible for a partner to develop a cavity, even if they have never had one before, if their partner has poor oral hygiene.

Kissing someone with poor dental hygiene isn't just gross, it can actually damage your smile, according to Dr. Tina Saw, cosmetic dentist and founder of Oral Genome. Bad dental hygiene can lead to plaque buildup, gum disease, and can create a breeding ground for bacteria.

Cavities don't go away on their own. Cavities slowly expand to the point where they can move into the pulp and pulp chamber of your tooth, causing you pain – which could eventually lead to needing a root canal. Therefore, try to get to the dentist as soon as you notice a cavity.

Catching a cavity by kissing is totally possible — technically. Say What?! While you may not be able to catch the actual cavity, you can definitely exchange bacteria with the person you are kissing.