Why? Fillings don't tend to bother me after they've been put in. If the filling you've had is bothering you then you should return to your dentist.
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I've had 5 fillings on 3 teeth (too much sugar when I was a kid). My dentist tried to save my tooth as it was pretty much destroyed because the filling fell out and it broke a little bit before the new filling. It's literally a metal tooth now (or w/e the hell makes the filling).