You may need a further booster for tetanus or polio after another 10 years if you're travelling abroad to high risk countries. If you think you may have missed any of the previous doses, talk to your school nurse or doctor. When everyone is immunised, polio will be eradicated from the world and there won't be any need to immunise in future. Polio like smallpox, will become a disease of the past. The tetanus and diptheria immunisation is given as an injection into your upper arm.
Polio vaccine is given by mouth.
Nobody like injections, but the needles used nowadays are very small and you only feel a tiny pin prick. If you're a bit nervous about having the injection, tell the nurse or doctor beforehand - it's nothing to be ashamed of. Swelling and redness at the site of the injection is common. Sometimes a small painless lump develops which usually disappears within a few weeks. More severe reactions are rare, and should be reported to your doctor.