A 43-year-old man complains about painful swallowing, limited mouth opening. Destroyed 37 tooth caused pain 3 days ago. Painful swallowing appeared the next day. Limited mouth opening was present a day later. Objectively: there is a small soft swelling in the left submaxillary area. An enlarged lymph node is palpated. The mouth can be opened by 1,5 cm. Edema of left palatine arch and pharynx lateral wall is present. The 37 tooth is destroyed. Mucous membrane around the tooth is edematic. Percussion is slightly painful. What is the most likely diagnosis?