A 37-year-old patient complains of severe pain in the gums, difficult chewing, smell of rot from the mouth, bleeding gums, along with general fatigue, headaches, body temperature up to 37,9°C.Objectively: large amout of soft dental deposit, shape of the gingival margin is abnormal, the gingival margin is covered with gray coating, regional lymph nodes are painful on palpation. What is the most likely diagnosis?