Article Summary: There can be a lot of confusion about whether having gaps in your teeth is a good or bad thing. Here, dental experts weigh in to debunk common myths about gapped teeth.Myth: Having a gap between your front teeth is a sign of good luck.Some cultures believe gaps in teeth are lucky, but a gap between teeth, called diastema, is a common occurrence. Teeth gaps frequently occur in young children whose permanent teeth have not come in yet."A gap between teeth has nothing to do with luck but is known to be a genetic trait," Mariya Malin, DDS, tells WebMD Connect to Care. "It is mostly caused by a low position of the lip muscle attachment to the gums in the middle right between the two front teeth on the bottom or the top," Malin says.