what causes pus gums
However, a person suffering from cavities should get treated immediately as the situation can get quite painful and develop into a serious gum infection. Causes of Gum Disease. The most common cause of gum infections are the germs and bacteria that dwell in the small gaps between your teeth. If left untreated, this infection can get worse and cause these gaps to grow big which may cause breakage of tooth. Here are the various causes for gum infection.