Hlo mam….as the history given by u…in my opinion as the tooth in which you are having problem u are saying that rct was done and crown was fitted and still u are experiencing pain while having food or when opposite tooth touches it,most probably the crown that is fitted there might be having high occlusion,for this u should consult your dentist and get it checked with articulating paper and get the occlusion adjusted.That will help with your problem. As there can be several reasons too for such problems that u r facing:- 1.Symptomatic apical periodontitis after rct 2.PDL inflammation or trauma 3.Inadequate or failed rct 4.Vertical root fracture/cracked abutment 5.periodontal problem around abutment 6.Bridge or cementation problem etc. And to rule out all the problem you need to get an x ray done and physical examination also done. If u have x ray kindly share it that will help us to guide u properly.

A long standing dental bridge can sometimes lead to sensitivity to the supporting teeth, and the ideal treatment procedure is to perform root canal and desensitising the sensitive teeth. If you have any x rays it would be better assessed. Sometimes patient feel pain after the crown has been fixed bcz of high points.

Pain in an RCT-treated tooth, especially pain triggered by biting or when the opposing tooth/bridge contacts it, does not automatically mean that the RCT has failed. Since the bridge was fitted only recently, one important possibility is that the bite is slightly high, putting excessive pressure on the treated tooth and its supporting tissues. This can cause significant tenderness on chewing. Other possibilities include inflammation around the root after RCT, an incompletely treated/missed canal, or less commonly a crack or another problem with the abutment tooth. The fact that the X-ray did not show infection is reassuring, but it does not completely rule out early inflammation.