有人问智齿的问题, 我简单说一下.
英语叫WISDOM tooth, which is normally buried under your gums.
它很多时候不长出来, 但很多时候长出来,歪的.
我用英语写比较容易:the usual problem of wisdom teeth is that they come out tilted and push the molars next to them. It is a rather difficult area to keep clean ~(between teeth). once the suger gets through, bacteria will then have a good environment to grow and that is how decay starts.
Please remember that decay only caused by sugar and sugar only.
then your teeth/gum might get infected, that is why someone has swllowen gums or sharp pain. In that case you just have to take anti-inflammatory pain killers like aspirin or ibuprofin (not paracetomol- which is not anti-inflammatory), or some anti-biotics (preferrable from your gp, because dentists charge £16.50 for giving your prescription, be careful of the allergies)
There is no garantee in biology or anything in life, if you have a tooth filled, it might well decay again.
Hope that answers your question.