You may not notice, but your teeth move throughout your life. As you age, telltale signs appear — crowded teeth or new gaps between them. Even food getting stuck can point to shifting teeth. Retainers for teeth help minimize unwanted tooth movement and reduce the chances of crowding or gaps over time, says Dr. Sercan Akyalcin, head of orthodontics and associate professor of developmental biology at the Harvard School of Dental Medicine. It’s more than just a smile issue. Stuck food promotes