Weird!

Like 3 years ago, i partially broke my two front teeth. I had it repare, the dentist fill it up with a kind of plaster and for the one more broken, insert two titanium pin in it(still wondering if I will make the metal detecter go on).
anyway, it,s been a couple days, I've been feeling pain where the pins are. I don,t understand why. There is no change in my diet. I do take care of my mouth and gum( at least brushing twice a day and using mouthwash at least once a day). Don't know why it hurts! Been driving me crazy!!! Espacilly since I don't have nerves in one half of the tooth.
Can someone explain why?