Tubal ligation is considered a permanent form of birth control, according to MedlinePlus, so it is meant to last for a woman's lifetime. WebMD explains that tubal ligation involves blocking, tying or cutting the fallopian tubes to prevent the fertilization of a woman's eggs by sperm.
Tubal ligation is an effective form of birth control, but it is not 100 percent effective, WebMD warns. Pregnancy may occur if the procedure is not performed properly or if the fallopian tubes grow back together.
Reversal of tubal ligation is possible, Medline advises, but it involves major surgery. More than 50 percent of women who undergo a reversal of tubal ligation can become pregnant.