For most people, oral diseases are something completely separate from other diseases and conditions in the body, however, oral health is inextricably linked to general health. Oral diseases have a significant impact on an individual’s quality of life and daily functioning. . The connection between oral and general health goes both ways. Some systemic diseases first manifest their symptoms in the oral cavity. The reverse is also true, as the health of the oral cavity also affects some other disease states. The health of periodontal tissues is the area where the connection between oral and general health is the most studied, especially in the area of cardiovascular diseases, complications during pregnancy and some metabolic disorders. Caring for the health of periodontal tissues and oral hygiene is particularly important in patients with diabetes, as their periodontal tissues are more sensitive to the development of inflammation. In addition to regular tooth brushing, chronic patients must also pay attention to regular dental examinations. This contributes to the timely detection of possible oral diseases and, at the same time, to better management of their primary chronic disease. Proper oral hygiene and, as a result, oral health prevent the occurrence of diseases in the oral cavity, which can also lead to tooth loss. The loss of several teeth has a negative impact on the quality of life and on the self-image of the individual. Otherwise, lost teeth can be replaced with various dental procedures (bridges, prostheses, implants). However, it is necessary to be aware that no replacement can completely replace natural teeth, so we advise preventive attention to appropriate oral hygiene and oral health. Scientists have found a link between certain bacteria in the mouth and a whole range of serious diseases. Millions of bacteria live in our mouths, some are good and beneficial, while others are bad and harmful.