As you have learned, you are susceptible to gum disease. And, you have probably learned, too, that the main cause of gum disease is bacterial plaque, a sticky, colorless film that constantly forms on your teeth. The bacteria in this plaque produce toxins, or poisons, which constantly attack your gums and teeth. Unless plaque is removed, it hardens into a rough, porous deposit called calculus, or tartar. Daily brushing and flossing will help to minimize the formation of calculus, but it won’t completely prevent it. No matter how careful you are in cleaning your teeth and gums, bacterial plaque can cause a recurrence of gum disease from two to four months after your last professional cleaning. Therefore, a dental professional must check for hidden problems and remove the hardened plaque at time intervals appropriate for you so that your teeth and gums stay healthy.