Let's be real here: There are plenty of people with gleaming white teeth who have likely gotten them bleached professionally. And for the extra #blessed set, they have genetics on their side. Then, there's the rest of us. "Most have to work to achieve pearly whites," Dr. Mazen Natour , DMD, Prosthodontist, says. "And some are more susceptible to gum disease and cavities [than others]."