If teeth are root canaled, u should not have pain. If u are having pain, there is something definitely wrong. There could be possible re-infection or the root canal filling was not done properly at that time.
Also you are having bad breath. This could be possible food getting lodged under the bridged tooth or there is re-infection with root canals teeth. The actual reason has to be ascertained with a clinical and xray examination. The bridge has to be removed and then treated accordingly.
Do not remove any teeth if they are good. Just get the bridge removed and get the necessary treatment done. Also, if u keep the root canaled tooth without a crown, there are high chances that it may get fractured. Hence, it should be crowns d again after necessary treatment.
Next Steps
Visit a dentist