The aim of this cross-sectional study was to assess the relationship between oral manifestations and systemic diseases particularly Diabetes Mellitus and Hypertension. Oral manifestations of systemic diseases are potential indicators of an array of conditions. Truly the oral cavity is a mirror that reflects and unravels many of the human body's internal secrets. There is a significant relationship between ‘oral health’ and ‘general health’. Systemic diseases like Hypertension, Heart disease and Diabetes Mellitus may affect oral health badly. The aim of this cross-sectional study was to assess the relationship between oral manifestations and systemic diseases particularly Diabetes Mellitus and Hypertension. We focused on the prevalent systemic diseases, which are Diabetes and Hypertension, in Geriatrics (age above 60) in Old People Care Homes. We found that Hypertension caused gingivitis. Diabetes caused Halitosis. In diabetic patients, there is increased breakdown of fats, which is converted to ketone bodies, these ketones are excreted in breath resulting in a condition known as halitosis. In conclusion, the relationship between Hypertension and Gingivitis was found to be significant. Diabetes was associated with halitosis.