Definitely not the dentists of the world. They can make the happiest day gloomy.
And I know this because I have rotten teeth. After a few years of sabbatical, I've returned to the dentist to be drilled, poked, prodded, numbed and violated once again. This dentist won't give me nitrous oxide, either, which is a total bummer, and that is the one thing I look forward to. Hell, he didn't even give me a sticker like his hygienist did during my cleaning.
Either way, my teeth are paying their dues for dental karma and the candy I ate as a kid. It's expensive, too. I've said it once and I will say it again, I believe the work done in my mouth is worth more money than I am.