How does a dentist replace a chipped filling?

K asked:


I am very scarred of the dentist. I think my filling has chipped and I would like to know if i need a total filling replacement , what does the dentist do. Do they have to redrill, or is there a way they can remove the filling without having to drill? Also, the chip is very very small and cannot be seen, but i can feel it with my tounge, could he just fill in the chip, or will there be a total replacement of the filling?

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