HPV vaccination is associated with a reduced risk of cervical cancer and its precursors, with greatest protection when the vaccine is administered before sexual debut. This review aims to discuss whether immunization with the nonavalent HPV vaccine should be recommended to women who have previously been vaccinated with the bi- or quadrivalent HPV vaccine and to women who have previously undergone treatment for condylomas or dysplasia of the vulva, vagina, or cervix.