Hi. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain as the bridge has broken and if there is no pain associated with the teeth over which the bridge was cemented then redoing of root canal treatment in all the teeth seems a bit questionable and I would like to see the x-ray of the region for guiding you better as then only I can rule out that whether there is need of repeating the root canal treatment or not.. You can also take an advise from an Endodontist who can take an x-ray and and advise you what to be done.. After the confirmation only that whether the teeth needs root canal treatment done again or not, the bridge can be replaced.. For the front 6 teeth which seems to have removable dentures a permanent bridge can be placed only in case if the remaining teeth over which the bridge will be cemented are in sound condition or not as they are having sound bone support or not so that they can bear the forces and this can also be confirmed by a clinical evaluation and an x-ray of the teeth that has to be prepared for cementing the bridge.. A properly fabricated bridge which is cemented on sound teeth which has a good bone support will have a long life and will not cause any problems after placement.. If you wish to get a proper advise before you proceed with the treatment you can send the concerned x-rays to me directly by going to my profile and writing your question there with concerned x-rays so that I can advise you correctly so that you can get treated properly.. Hope this information helps.. If you find the answer helpful please give me a Five Star Review and click on found the answer helpful as a token of appreciation.. Thanks and regards.. Dr.Honey Nandwani Arora..