Syphilis is not usually transmitted through the saliva of the patient. Syphilis is mainly transmitted through sexual transmission, mother-to-child transmission, blood transmission, mainly because the syphilis virus exists in human blood and sexual genital secretions, the human saliva syphilis virus content is small, and can not constitute the conditions for transmission, through saliva transmission of respiratory diseases, such as influenza, tuberculosis, chicken pox and other diseases. When the patient suffers from bleeding mouth ulcers or bleeding gums, the saliva mixed with blood can constitute transmission. However, this requires a certain amount of bleeding and needs to pass through broken skin, and a small amount of bleeding contains a relatively low amount of virus, so the probability of transmission under such extreme conditions is also relatively low. It is also essentially caused by blood transmission. If you suspect that you have been exposed to a syphilis patient, you can consult the Department of Venereal Diseases of a regular hospital and improve the relevant examinations to make a clear diagnosis, so as not to delay the condition.