Why Do Two of my Molars Hurt After White Composite Filling? (photo)

I went to the dentist about 2 months ago to get filling, however, after and still now I feel a pinch in two of the molars to which fillings were done. The pinching happens when I push on them w/ the tip of my finger( I did this to find the molars that pinched) and when I eat food that is chewy like steak. Also, when I eat a piece of chocolate the pinching is stronger almost as if my tooth had a cavity.

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