If the interval between all three doses of the nine-valent cervical cancer vaccine has been exceeded, but the excess time is short, you can continue to follow the process to try to complete all three doses of the nine-valent cervical cancer vaccine within one year. Usually, the three doses are completed within six months to achieve better preventive effect. If the interval is too long, the effect of vaccination may be affected and you need to consult your doctor to determine whether you need to start over from the first dose. The nine-valent cervical cancer vaccine is one of the cervical cancer vaccines. The cervical cancer vaccine also includes the bivalent cervical cancer vaccine and the quadrivalent cervical cancer vaccine, which are mainly used to prevent cervical cancer caused by human papilloma virus (HPV) infection. The nine-valent cervical cancer vaccine is suitable for people aged 16-26 years old in China, and the interval between the three vaccinations is 0, 2 and 6 months respectively, specifically, the first vaccination is in month 0, which is the first injection, followed by the second vaccination in month 2 and the third vaccination in month 6. The nine-valent cervical cancer vaccination can prevent about 90% of cervical cancer, and can also prevent malignant tumors such as vaginal cancer and anal cancer. In addition, for other age groups, the bivalent cervical cancer vaccine or quadrivalent cervical cancer vaccine can also be used as a preventive measure. The bivalent cervical cancer vaccine is suitable for women aged 9-45 years old and is administered in the 0th, 1st and 6th months. The quadrivalent cervical cancer vaccine, on the other hand, is indicated for women aged 20-45 years, with vaccination intervals of months 0, 2, and 6. Since the cervical cancer vaccine does not provide 100% protection against cervical cancer and may be less effective for women who have had sex or who already have HPV infection in their bodies. Therefore, women are advised to visit hospitals regularly for cervical cancer screening for early detection, diagnosis and treatment.