A 50-year-old patient complains about increased sensibility of the exposed tooth cervixes, displacement of teeth, gum itch, pain in the region of the 43, 42, 41, 31, 32, 33 teeth caused by chemical and thermal stimuli. Objectively: the gums are dense and anemic. X-ray picture shows atrophy of the alveolar bone reaching 2/3 of interalveolar septa height. What is the most likely diagnosis?