Sounds like they are trying to do some fixed prosthodontic work by making a bridge to replace the lost natural structure and prevent drifting of adjacent teeth and overeruption of opposing teeth. To make a bridge, a dentist, has to cut sound adjacent teeth and make abutments.

There is nothing that can replace your own natural structures and to eliminate the complications of extractions, you need replacements. The bridges do last (how long ? no one can answer you that and there is no guarentee) if you have good oral hygiene and type of dentistry done.

The cheaper alternative is just to make a removable denture or even flipper may do.

If you want more advance type of dentistry then go for implants. It will be just like your natural tooth, without having to sacrifice your natural tooth structures.

BTW where are you ?