Ovarian teratoma is a type of commonly seen benign ovarian tumor. Even though it is benign, like in the case of teratomas, it can still potentially affect a woman's fertility. The critical factors are the location and the size of the ovarian tumor. If the tumor originates from the center of the ovary, it is likely to cause significant damage to the ovarian tissue. Additionally, if the tumor is large, it can also cause substantial damage to the normal tissue. These factors can impact a woman’s fertility, leading to a decline or even complete loss of reproductive function. Whether fertility is retained depends on the function of the ovary on the other side.