As a kid, like all of them, I too had this mortal fear of needles, getting shots, having blood work done, etc, but once I got older, I realized that there's really nothing to worry about... heck, I'm not bothered by them... I can't remember the last time I had a shot, but I have bloodwork done maybe once or twice a year at most, and I really don't feel a thing... of course, part of it too has to do with who exactly is drawing the blood... 9 out of 10 times I get someone with a caring touch, but there's an occasion where it's not quite the case: one time I was having blood drawn, but the nurse missed my vein completely, and the needle was actually sucking on the muscle... THAT hurt, but other than that, having blood drawn doesn't hurt, and there's barely even that half-second pinch you feel, I don't feel that anymore.
As far as brushing teeth goes... gee whiz, do not get me started... my mom is OCD about dental hygiene, it's not even funny, it's psychotic... she not only brushes after every meal, but she'll actually just randomly brush her teeth at any given moment because she feels compelled to do so, and she's always trying these crack whitening things you see on TV that never even work anyway because on TV people's teeth are un-naturally white because of special lighting or digital enhancements or whatever, teeth in real life are never that white. Besides, dentists actually say that excessive brushing actually does more harm than good, because excessive brushing adds that much wear and tear to the enamal on your teeth.