4yrs ago I had a sever decay in my first molar tooth and had been to a dentist, where I was advised to remove the tooth. During the procedure the dentist was not able to remove the whole tooth and few pieces of the tooth were left and I was told, as the pieces are too small it cannot be pulled out and I would have to go through an operation. Which I have been avoiding as I had no pain or issue with the remains.
However, from past 1 week I have had some needling pain whn i try sucking the tooth. Which is reduced and almost nil now. But I see a swelling in the gum of that teeth. And the swelling is not close to the teeth, it is much below near my jaw line and it pains only when I press it.
Could you please tell me how serious the problem is and what could be the treatment?