Periodontitis is a chronic inflammatory disease in the tooth
supporting tissues, which appears as
gingival bleeding, increased tooth mobility and deepened periodontal pockets.
As in humans, the presence of bacteria causes bad breath (bacteria stinks), and the accumulation of tartar causes irritation and inflammation to the gums around the dog's teeth (gingivitis, under the form of red, swollen gums), which in turn may lead to periodontal disease (the loss of the connective tissue fibers, ligaments and bone surrounding the teeth and responsible for
supporting them) and eventually tooth loss due to gradual loss of
supporting structure — see photo, something known as
gingival recession.