Generally speaking, kissing is not contagious, but under special circumstances, it can be contagious. Why is this said? This is because if there are any damages or gaps in the mouth, and in this case, if the other party has a sexually transmitted disease, the pathogens can enter the body through the gaps in the mouth, so kissing can sometimes spread diseases, including sexually transmitted diseases. . Therefore, we cannot simply understand this problem. Under normal circumstances, 99% are not contagious, but 1% may be infected through this way. Of course, this method is extremely rare in clinical practice. At least so far, I have not seen sexually transmitted diseases transmitted through oral kissing. Generally speaking, oral infectious diseases are mainly transmitted through sexual intercourse, which may be different from simple kissing.

Generally speaking, general kissing (ceremonial, social) is relatively safe, while deep kissing (both parties exchange saliva, and even bleeding) is dangerous for certain types of kisses that may pass through body fluids (blood ) spread of sexually transmitted diseases (such as syphilis, AIDS), there is a certain risk.