Hello sir !
As per your description , there seems to be a piece of root visible in the oral cavity. Ideally root stumps need to be extracted or else they might get infected.
But keeping in mind the age , medical condition and the need to replace teeth , the root stump can be left in the mouth.
The prosthesis /denture can be fabricated over it as it preserves the bone , if at all there is need for it. This can only be done by clinical examination and x-ray of the root stump .
Next Steps
Get clinical examination done , followed by required x-ray .
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