It is the inflammation of the gums by bacterial plaque. This inflammation is a response from the body to attack by setting up a defense system: the immune system. It is often a painful swelling of the gums, which appears red, smooth and sometimes bleeding at the slightest touch (during chewing or brushing). This gingivitis can be localized to one or more teeth but can also extend to the whole of the dental arch. The disease is the first step of diseases that can reach the periodontium. In addition, recent studies suggest that the bacterium Bacteriodes gingivitis, which is involved in gingivitis, could be linked with arterioscleroses. It is reversible if eliminate bacterial plaque that is the cause and the establishment of an effective brushing, a scaling if necessary and use as an adjunct antiseptic mouthwash prescribed by the dentist.