You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is You are presented with a patient having a diffuse swelling in the neck bilaterally below the chin region. Intra orally the Lower molar is infected on left side

What is the probable source of infection? and explain in detail?
None