I could give you a catalogue of them. When I was 10, a so-called 'friend' pushed me down a step during a game and I broke my two front teeth. She told me to stop screaming in case her parents found out (she lived next door). I had to have my teeth crowned ... lots of painful visits to the dentist during my teenage years and much micky-taking from said 'friend' and her cronies. I don't t think she ever felt a bit sorry or guilty about what she'd done.
Forty years, thirteen crowns, several extractions and more fillings and root canal treatments than I care to remember, I'm 'looking forward' to my first denture this summer. I have a great dentist - thorough, understanding and never takes 'can't be done' for an answer. She is amazed at how many root canal fillings I already have and was at pains to understand why (she hasn't always been my dentist). When I explained about my childhood accident, she said there's a high chance that the impact caused much more nerve damage than anyone was able to detect at the time and that I'm lucky to have lived this long without losing them all.
Can't say I can look back and laugh at the incident, though, or even at the amount of treatment I've had. I'm just very bitter, and that friend better pray she never has to meet me again, or I may just be tempted to carry out a little dentistry of my own!