Hi9 | What Causes Gum Disease | Dr.Snigdha Gowd | Orthodontics & Dentofacial Orthodontics | Dr.Gowd's Dental Hospital - Gum diseases are caused mainly because of improper brushing habits some times lot of people neglect their brushing that is lot of teeth area they don't brush the plugged of accumulated on the tooth surface which becomes thick and becomes calculus this causes gums to swell and starts causing bad breath, once the teeth starts causing the bad breath and gums are swollen then the teeth starts bleeding