i've had a fair few, and i really dreaded it everytime  :S  i don't like the needle being stuck into your gums :P  but the worst bit is the drilling, the sound and vibrations more than anything  :blink:  one time, they didn't inject enough aneasthetic on my bottom jaw, they started to drill, and i felt the most painfull feeling i've ever felt in my life  :P  they had to inject me again, needless to say that's the last time i ever went to the dentists  :)