Hi! Based sa standard protocol, ang 2 shots ng Anti-Tetanus ay nagbibigay ng protection for about 5-10 years, pero honestly depende pa rin sa individual response at sa exact vaccine schedule mo, kaya best talaga na i-check mo with your doctor kung kelan ka na dapat mag-booster, lalo na if may specific reason ka (like injury or something). A few of us moms usually just ask our pedia or OB during checkups kung overdue na kami for booster, easier lang na way to keep track!