Hello, Thanks for your query. Periodontal disease is the infection of the gums, and it gradually destroys the support system for your teeth. Dental plaque is the primary cause of gum disease. Bacteria inside plaque creates toxins, which irritate the gum tissue. Irritated gums may swell and bleed. If the irritation continues for too long, the gums separate from the teeth, causing spaces to form. I do hope that you have found something helpful and I will be glad to answer any further query. Take care