Good day
A bridge is usually used to replace 1 or more missing teeth and is attached to abutment teeth with "fake " teeth hanging in the middle. Depending on the condition of the abutment teeth, you can section or cut the bridge in order to possibly save one or both of the abutment teeth with their crowns and then replace the pontics, or missing teeth, with an implant/s. If both the abutment teeth are in poor condition, they can also be extracted,after the bridge was sectioned, and then replaced with either immediate implants for an implant bridge, or individual implants, depending on the space availability and condition of the bone, as well as the proximity to other anatomical important structures.
Hope this helps