Periodontal disease have been unfortunately and unknowingly suffered by 80 percent of Americans which does not only causes swollen gums and ruin teeth, gums and connective tissues, but also leads to heart disease, diabetes, respiratory illness, stroke and low birth weight and pre-term births in a cryptic manner. Gingivitis during pregnancy is prevalent and curable even without medications or surgery. To avoid such bad gum conditions, one should be able to know the cause of periodontal disease. Most people are made unaware that periodontal disease is contagious and was probably contracted at an early age. Disease -causing bacteria is passed from one person to another, and instigates tooth decay and swollen gums which is the first stage of periodontal disease.