There are essentially two types
Gingivitis - a reversible condition which responds very quickly to changes in oral hygiene practice. Brushing up on your technique (pun intended) will control this disease.
Periodontitis - an irreversible condition which results in damage to the bone support of the teeth, that can eventually lead to tooth loss.
Regular dental examinations and hygienist visits WILL help to stop gum disease and when you follow the advise your mouth WILL be healthier.