Beauties, did you know that cavities are contagious? Yes, sharing drinks, kissing, or any other spit-swapping activity can make the bacteria that cause nasty dental problems (from gum disease to cavities) move from one mouth to another. "There are studies that show that babies can have cavity bacteria in their mouths even before they have any teeth," says Pacific Palisades, CA dentist Dr. Emma Kim. "Mothers transfer bacteria and plaque from their own mouth to their baby's through their saliva." So if you haven't seen the dentist lately for a regular check-up and cleaning, don't go kissing any babies! "Healthy adults are able to fight off this transferred bacteria so it's not usually a problem, but babies are at risk," says Dr. Kim. Since we all know that a beautiful smile begins with healthy teeth, keep up the brushing and flossing, Beauties!