The state of your mouth can offer valuable insights into your dental, oral and overall health. Here are some things to watch for: 1) Bleeding when you brush your gums could be a sign of gum disease. 2) Sugar sensitivity usually indicates a cavity, but cold sensitivity might just indicate that a change of toothpaste is needed. Heat sensitivity could be more serious. 3) Bad breath can be caused by poor oral hygiene, but sometimes by a throat infection. A good electric toothbrush, flossing and scraping your tongue all help, and be sure to see your dentist regularly!