Oral health is essential to general health and good quality of life. Untreated dental infection lead to difficulties with chewing , pain and serious infection; these issues extend beyond the oral cavity and can play a role in systemic diseases. Many systemic diseases and issues can affect oral health, making oral health diseases more severe. Oral manifestations of diabetes are multiple and directly related to the degree of control of the disease. There are a number of problems including xerostomia, candidiasis and stomatopyrosis. Poorly controlled diabetes affects oral health by increasing the risk and progression of periodontitis and tooth loss. Furthermore, periodontitis can adversely affect glycaemic control in persons with diabetes. Pregnant women may experience a significant rise in the amount of circulating sex hormones which can, together with insufficient oral hygiene, cause pregnancy gingivitis and the formation of pregnancy granuloma. The effect of progesterone and oestrogen on periodontal tissues has been reported and evidence exist that suggest an association between maternal periodontitis and the risk of premature labour and other adverse pregnancy outcomes. Periodontal disease is an independent risk factor for the development of atherosclerosis. The DNA of periopathogens has been found within atherosclerotic plaque. Periodontal bacteria trigger vascular cell proliferation and facilitate platelet aggregation. There is numerous evidence that oral and general health form an indivisible whole with abundant interconnections. Poor oral health is a risk to general health, so appropriate oral hygiene is an extremely important component of taking care of one’s health.