Periodontal disease is an infection of the tissues supporting and around your teeth. It is often painless, so you may not even realize you have it. It’s one of the main reasons that adults may lose their teeth. Gum disease results from plaque, the sticky bacteria on teeth. If your gums bleed easily, are sore or red, or your teeth seem to be loose. Gum disease can cause many problems before you are even aware of it and regular checkups are very important.