According to the parents of a 7-year-old child, the child complains about weakness, body temperature rise up to 39°C, toothache in the upper jaw on the left. Objectively: condition is grave, the child is pale and adynamic, the face is asymmetric because of infiltration of the upper jaw on the left. The 64 tooth has a carious cavity. Percussion is painful, I degree of teeth mobility is also present. There are purulent discharges from the subgingival edge of the 64 tooth. Mucogingival fold of the 63, 64, 65 teeth is smoothed. Vestibular and palatine mucous membrane is edematic. What is the most likely diagnosis?