Not a candidate for dental implants - what are my options for fixing my bridge?

I've had my four frontal teeth bridge procedure done years ago. I want to replace my bridge because it has a permanent stain in between two teeth and the bridge looks like it's one wide teeth because the gap in between them were not deep enough. I am not a candidate for implants so I am looking to see if I have a other options to make my smile look better. What other procedures are available out there? What type of dentist do I look for to help me get the proper treatment?