The saliva itself is not usually harmful to the uterus. When a healthy person performs oral sex on a woman, the saliva enters the vagina and even the uterus and does not affect the uterus in any way. However, if the partner himself suffers from oral diseases, the saliva will carry many bacteria into the vagina, then there will be the possibility of gynecological infections, such as vaginitis, pelvic inflammatory disease, cervicitis and so on. Therefore, it is recommended to pay attention to personal hygiene and avoid unclean sex. Moderate healthy sex life, if there are leukorrhea abnormalities suggesting disease, need to consult a doctor in time for examination and treatment.