There are new root canal filling materials that provide a better
seal and therefore prevent infection and are non-toxic.

If you pull the root canaled tooth and put in a bridge,it is likely that you will eventually lose the two teeth that will form the bridge due to nerve damage from preparing the bridge and subsequent infection .Preparing a tooth for a bridge is also more likely to fracture a tooth that placing a filling.Ofcouse someone will say that they have no problems with their bridge but they are the exception to the rule.