I have a root canal and a cap on the lower front bottom tooth. The adjacent five teeth are also capped. I now now a shadow around the gum( with no pain).My dentist says it is best to remove the four bottom teeth and put a bridge with the bottom canine teeth as the anchors.I was always taught its best to keep your teeth. He says the roots are very shallow  and the bridge would be strong. Once a  shadow appears, there is infection. Thank you I advance.
Hello, Your periodontal health needs to be considered when making a choice for placement of crowns and bridges.  Healthy bone support will lead to a good long term prognosis. If a tooth has reoccurring infection, bone support loss, thin tooth structure or a small percentage of root in bone, there is a good risk of fracture. If you have new crowns and a tooth fractures, then these new crowns would need to be replaced to place a fixed bridge. Another option involving a single tooth or multiple teeth would be to consider an implant. I always encourage my patients to keep natural teeth when possible and often consider implants as an option to a fixed bridge. Thank you for your inquiry. Please consider an evaluation by a periodontist if you have concerns about the strength of your bone support for your teeth. This will help you make an informed decision.