With periodontitis, due to infection, the gum tissue and periodontal ligament peel off from the tooth, forming periodontal pockets. Plaque gets into them, is compressed and turns into tartar. This tartar under the gums is an ideal environment for the reproduction of bacteria. It is impossible to clean the tartar and infection at home, since the tartar is attached to the surface of the root, growing into its pores. Even standard professional hygiene at the dentist affects only 1-2 mm of the subgingival space, while the pocket depth can reach 6 mm.
As a result, pathological growth of the bacterial colony occurs. Even if initially only one tooth was infected, the infection spreads to all teeth and gums.
Bacteria cause inflammation and intoxication of tissues, the gums become inflamed, swell, and the vessels become fragile. Because of this, with periodontitis, the gums are often painful and bleed even with light pressure.