Tuberculosis is a disease that can be transmitted through saliva. TB is an infectious disease of the respiratory system, and sputum-excreting TB patients are the source of infection. Therefore, the saliva produced by sputum-excreting TB patients contains a large number of Mycobacterium tuberculosis bacteria, and individuals who come into contact with this saliva may be exposed to TB if they are in good health. The transmission of tuberculosis includes respiratory, digestive and skin infections, with respiratory droplet transmission being the main way of transmission. The onset of TB will lead to symptoms such as weakness, night sweats, low afternoon fever, coughing and sputum. Individuals with suspected symptoms are advised to seek medical attention and treatment as prescribed by the doctor.