We need to get digital OPG done, to know the cause, it might be due to periodontal problem(gum) or incorrect RCT..? ( shot, missing or over obstruction), Before commenting on any option need to examine and see X-ray. So that we can rule out cause.
Next Steps
Get OPG done
Health Tips
Regular oral prophylactic method should be followed (brushing, flossing, mouth wash) to avoid food being stuck below crown(cap) .