Dear Doctors: This hasn’t been a red-letter month for me health-wise. I’m sporting new eyeglasses because of macular degeneration, I need a medical for my driver’s licence renewal, and my last young dentist told me my teeth are mobile and spaces are opening up between them. I admit I didn’t listen to his explanation other than they need attention. What is Cole’s Notes version of mobile teeth and spaces? How did this occur, and what can be done about it?