Gum diseases are of two types – Gingivitis and periodontal diseases. They are usually caused by poor oral hygiene. Gingivitis is caused by the build-up of plaque along the gum line and is characterised by inflamed gums. When gingivitis is not treated, it could develop into periodontal disease which can weaken the bone surrounding the teeth and lead to tooth loss. To avoid all these hassles, you must maintain good oral health.