Periodontal diseases lead to irreparable loss of tissues surrounding the teeth, and even with no symptoms of acute gingivitis (redness, bleeding, swelling of gums) lesions in the form of bone defects around the roots, which may even lead to tooth loss. The only solution for such teeth is the method of guided regeneration of tissues and bones. These techniques, successfully applied in our Clinic, allow for effective regeneration of lost or damaged tissues thanks to the use of state-of-the-art achievements of material engineering: barrier membranes and materials supporting bone tissue regeneration (Emdogein, biomaterials – Bio-Oss, BioGranCerasorb, Nano Bone).