If you're counting dental treatment, I remember having to have two teeth (I don't remember where, but I think they were the pointy ones) removed when I was about 7 in order to get the rest of my teeth to grow straighter. They gave me something that made my mouth go numb, and I remember having to miss the afternoon of school after and going home and attempting to sleep it off in my Mum's bedroom, and then when we went to school in the afternoon, I think to pick up my brother from nursery (Where children go before they start school in our country), I remember my Mum showing my teacher the teeth in a small container.
Other than that, no. I've been quite lucky, and I'm scared of the day when that may change.