What Causes gum disease?
Our mouths are full of bacteria. These bacteria, along with mucus and other particles, constantly form a sticky, colorless, plaque on teeth. Brushing and flossing help get rid of plaque. Plaque that is not removed can harden and form "tartar" that brushing doesn't clean. Only a professional cleaning by a dentist or dental hygienist can remove tartar.
Dr. James L. Johnson